Convert checkApiLogic to AiAbilityDecision

forge-ai/src/main/java/forge/ai/AiPlayDecision.java

@@ -5,6 +5,8 @@ public enum AiPlayDecision {
     WillPlay,
     MandatoryPlay,
     PlayToEmptyHand,
+    ImpactCombat,
+    ResponseToStackResolve,
     AddBoardPresence,
     Removal,
     Tempo,
@@ -22,14 +24,18 @@ public enum AiPlayDecision {
     CantPlayAi,
     CantAfford,
     CantAffordX,
+    DoesntImpactCombat,
+    DoesntImpactGame,
     MissingLogic,
     MissingNeededCards,
     TimingRestrictions,
     MissingPhaseRestrictions,
+    ConditionsNotMet,
     NeedsToPlayCriteriaNotMet,
     StopRunawayActivations,
     TargetingFailed,
     CostNotAcceptable,
+    LifeInDanger,
     WouldDestroyLegend,
     WouldDestroyOtherPlaneswalker,
     WouldBecomeZeroToughnessCreature,
@@ -39,7 +45,7 @@ public enum AiPlayDecision {
 
     public boolean willingToPlay() {
         return switch (this) {
-            case WillPlay, MandatoryPlay, PlayToEmptyHand, AddBoardPresence, Removal, Tempo, CardAdvantage -> true;
+            case WillPlay, MandatoryPlay, PlayToEmptyHand, AddBoardPresence, ImpactCombat, ResponseToStackResolve, Removal, Tempo, CardAdvantage -> true;
             default -> false;
         };
     }

forge-ai/src/main/java/forge/ai/ComputerUtilCard.java

@@ -1819,18 +1819,18 @@ public class ComputerUtilCard {
      * @param sa Pump* or CounterPut*
      * @return
      */
-    public static boolean canPumpAgainstRemoval(Player ai, SpellAbility sa) {
+    public static AiAbilityDecision canPumpAgainstRemoval(Player ai, SpellAbility sa) {
         final List<GameObject> objects = ComputerUtil.predictThreatenedObjects(sa.getActivatingPlayer(), sa, true);
 
         if (!sa.usesTargeting()) {
             final List<Card> cards = AbilityUtils.getDefinedCards(sa.getHostCard(), sa.getParam("Defined"), sa);
             for (final Card card : cards) {
                 if (objects.contains(card)) {
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.ResponseToStackResolve);
                 }
             }
             // For pumps without targeting restrictions, just return immediately until this is fleshed out.
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         CardCollection threatenedTargets = CardLists.getTargetableCards(ai.getCardsIn(ZoneType.Battlefield), sa);
@@ -1849,11 +1849,11 @@ public class ComputerUtilCard {
             }
             if (!sa.isTargetNumberValid()) {
                 sa.resetTargets();
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.ResponseToStackResolve);
         }
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     public static boolean isUselessCreature(Player ai, Card c) {

forge-ai/src/main/java/forge/ai/SpecialAiLogic.java

@@ -214,7 +214,7 @@ public class SpecialAiLogic {
     }
 
     // A logic for cards that say "Sacrifice a creature: put X +1/+1 counters on CARDNAME" (e.g. Falkenrath Aristocrat)
-    public static boolean doAristocratWithCountersLogic(final Player ai, final SpellAbility sa) {
+    public static AiAbilityDecision doAristocratWithCountersLogic(final Player ai, final SpellAbility sa) {
         final Card source = sa.getHostCard();
         final String logic = sa.getParam("AILogic"); // should not even get here unless there's an Aristocrats logic applied
         final boolean isDeclareBlockers = ai.getGame().getPhaseHandler().is(PhaseType.COMBAT_DECLARE_BLOCKERS);
@@ -222,14 +222,14 @@ public class SpecialAiLogic {
         final int numOtherCreats = Math.max(0, ai.getCreaturesInPlay().size() - 1);
         if (numOtherCreats == 0) {
             // Cut short if there's nothing to sac at all
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantAfford);
         }
 
         // Check if the standard Aristocrats logic applies first (if in the right conditions for it)
         final boolean isThreatened = ComputerUtil.predictThreatenedObjects(ai, null, true).contains(source);
         if (isDeclareBlockers || isThreatened) {
             if (doAristocratLogic(ai, sa)) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         }
 
@@ -247,7 +247,7 @@ public class SpecialAiLogic {
         if (countersSa == null) {
             // Shouldn't get here if there is no PutCounter subability (wrong AI logic specified?)
             System.err.println("Warning: AILogic AristocratCounters was specified on " + source + ", but there was no PutCounter SA in chain!");
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlaySa);
         }
 
         final Game game = ai.getGame();
@@ -263,7 +263,7 @@ public class SpecialAiLogic {
         relevantCreats.remove(source);
         if (relevantCreats.isEmpty()) {
             // No relevant creatures to sac
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
         }
 
         int numCtrs = AbilityUtils.calculateAmount(source, countersSa.getParam("CounterNum"), countersSa);
@@ -287,16 +287,20 @@ public class SpecialAiLogic {
                                 || (combat.isAttacking(card) && combat.isBlocked(card) && ComputerUtilCombat.combatantWouldBeDestroyed(ai, card, combat))
                 );
                 if (!forcedSacTgts.isEmpty()) {
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
 
                 final int numCreatsToSac = Math.max(0, (lethalDmg - source.getNetCombatDamage()) / numCtrs);
 
                 if (defTappedOut || numCreatsToSac < relevantCreats.size() / 2) {
-                    return source.getNetCombatDamage() < lethalDmg
-                            && source.getNetCombatDamage() + relevantCreats.size() * numCtrs >= lethalDmg;
+                    if (source.getNetCombatDamage() < lethalDmg
+                            && source.getNetCombatDamage() + relevantCreats.size() * numCtrs >= lethalDmg) {
+                        return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
+                    }
+
+                    return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
                 } else {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             } else {
                 // We have already attacked. Thus, see if we have a creature to sac that is worse to lose
@@ -309,7 +313,7 @@ public class SpecialAiLogic {
                 );
 
                 if (sacTgts.isEmpty()) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                 }
 
                 final boolean sourceCantDie = ComputerUtilCombat.combatantCantBeDestroyed(ai, source);
@@ -317,7 +321,10 @@ public class SpecialAiLogic {
                 final int DefP = sourceCantDie ? 0 : Aggregates.sum(combat.getBlockers(source), Card::getNetPower);
 
                 // Make sure we don't over-sacrifice, only sac until we can survive and kill a creature
-                return source.getNetToughness() - source.getDamage() <= DefP || source.getNetCombatDamage() < minDefT;
+                if (source.getNetToughness() - source.getDamage() <= DefP || source.getNetCombatDamage() < minDefT) {
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                }
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         } else {
             // We can't deal lethal, check if there's any sac fodder than can be used for other circumstances
@@ -329,7 +336,11 @@ public class SpecialAiLogic {
                             || ComputerUtil.predictThreatenedObjects(ai, null, true).contains(card)
             );
 
-            return !sacFodder.isEmpty();
+            if (sacFodder.isEmpty()) {
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
+            }
+
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
     }
 

forge-ai/src/main/java/forge/ai/SpecialCardAi.java

@@ -400,7 +400,7 @@ public class SpecialCardAi {
 
     // Donate
     public static class Donate {
-        public static boolean considerTargetingOpponent(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision considerTargetingOpponent(final Player ai, final SpellAbility sa) {
             final Card donateTarget = ComputerUtil.getCardPreference(ai, sa.getHostCard(), "DonateMe", CardLists.filter(
                     ai.getCardsIn(ZoneType.Battlefield).threadSafeIterable(), CardPredicates.hasSVar("DonateMe")));
             if (donateTarget != null) {
@@ -410,7 +410,7 @@ public class SpecialCardAi {
 
                 // All opponents have hexproof or something like that
                 if (Iterables.isEmpty(oppList)) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                 }
 
                 // filter for player who does not have donate target already
@@ -428,12 +428,11 @@ public class SpecialCardAi {
                 if (opp != null) {
                     sa.resetTargets();
                     sa.getTargets().add(opp);
-                    return true;
                 }
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
             // No targets found to donate, so do nothing.
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         public static AiAbilityDecision considerDonatingPermanent(final Player ai, final SpellAbility sa) {
@@ -452,7 +451,7 @@ public class SpecialCardAi {
 
     // Electrostatic Pummeler
     public static class ElectrostaticPummeler {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             final Card source = sa.getHostCard();
             Game game = ai.getGame();
             Combat combat = game.getCombat();
@@ -465,13 +464,13 @@ public class SpecialCardAi {
                 if (saTop.getApi() == ApiType.DealDamage || saTop.getApi() == ApiType.DamageAll) {
                     int dmg = AbilityUtils.calculateAmount(saTop.getHostCard(), saTop.getParam("NumDmg"), saTop);
                     if (source.getNetToughness() - source.getDamage() <= dmg && predictedPT.getRight() - source.getDamage() > dmg)
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
 
             // Do not activate if damage will be prevented
             if (source.staticDamagePrevention(predictedPT.getLeft(), 0, source, true) == 0) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactGame);
             }
 
             // Activate Electrostatic Pummeler's pump only as a combat trick
@@ -480,14 +479,14 @@ public class SpecialCardAi {
                     // We'll try to deal lethal trample/unblocked damage, so remember the card for attack
                     // and wait until declare blockers step.
                     AiCardMemory.rememberCard(ai, source, AiCardMemory.MemorySet.MANDATORY_ATTACKERS);
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             } else if (!game.getPhaseHandler().is(PhaseType.COMBAT_DECLARE_BLOCKERS)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
             }
 
             if (combat == null || !(combat.isAttacking(source) || combat.isBlocking(source))) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             boolean isBlocking = combat.isBlocking(source);
@@ -512,11 +511,11 @@ public class SpecialCardAi {
                 }
                 if (totalDamageToPW >= oppT + loyalty) {
                     // Already enough damage to take care of the planeswalker
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
                 }
                 if ((unblocked || canTrample) && predictedPT.getLeft() >= oppT + loyalty) {
                     // Can pump to kill the planeswalker, go for it
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
                 }
 
             }
@@ -537,31 +536,31 @@ public class SpecialCardAi {
                     // We can deal a lot of damage (either a lot of damage directly to the opponent,
                     // or kill the blocker(s) and damage the opponent at the same time, so go for it
                     AiCardMemory.rememberCard(ai, source, AiCardMemory.MemorySet.MANDATORY_ATTACKERS);
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
                 }
             }
 
             if (predictedPT.getRight() - source.getDamage() <= oppP && oppHasFirstStrike && !cantDie) {
                 // Can't survive first strike or double strike, don't pump
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
             }
             if (predictedPT.getLeft() < oppT && (!cantDie || predictedPT.getRight() - source.getDamage() <= oppP)) {
                 // Can't pump enough to kill the blockers and survive, don't pump
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
             }
             if (source.getNetCombatDamage() > oppT && source.getNetToughness() > oppP) {
                 // Already enough to kill the blockers and survive, don't overpump
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
             }
             if (oppCantDie && !source.hasKeyword(Keyword.TRAMPLE) && !source.isWitherDamage()
                     && predictedPT.getLeft() <= oppT) {
                 // Can't kill or cripple anyone, as well as can't Trample over, so don't pump
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
             }
 
             // If we got here, it should be a favorable combat pump, resulting in at least one
             // opposing creature dying, and hopefully with the Pummeler surviving combat.
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
         }
 
         public static boolean predictOverwhelmingDamage(final Player ai, final SpellAbility sa) {
@@ -693,13 +692,13 @@ public class SpecialCardAi {
 
     // Gideon Blackblade
     public static class GideonBlackblade {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             sa.resetTargets();
             CardCollectionView otb = CardLists.filter(ai.getCardsIn(ZoneType.Battlefield), CardPredicates.isTargetableBy(sa));
             if (!otb.isEmpty()) {
                 sa.getTargets().add(ComputerUtilCard.getBestAI(otb));
             }
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
     }
 
@@ -930,12 +929,12 @@ public class SpecialCardAi {
 
     // Living Death (and other similar cards using AILogic LivingDeath or AILogic ReanimateAll)
     public static class LivingDeath {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             // if there's another reanimator card currently suspended, don't cast a new one until the previous
             // one resolves, otherwise the reanimation attempt will be ruined (e.g. Living End)
             for (Card ex : ai.getCardsIn(ZoneType.Exile)) {
                 if (ex.hasSVar("IsReanimatorCard") && ex.getCounters(CounterEnumType.TIME) > 0) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             }
 
@@ -946,7 +945,7 @@ public class SpecialCardAi {
 
             if (aiCreaturesInGY.isEmpty()) {
                 // nothing in graveyard, so cut short
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
             
             for (Card c : ai.getCreaturesInPlay()) {
@@ -978,17 +977,30 @@ public class SpecialCardAi {
             }
 
             // if we get more value out of this than our opponent does (hopefully), go for it
-            return (aiGraveyardPower - aiBattlefieldPower) > (oppGraveyardPower - oppBattlefieldPower + threshold);
+            if ((aiGraveyardPower - aiBattlefieldPower) > (oppGraveyardPower - oppBattlefieldPower + threshold)) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            }
         }
     }
 
     // Maze's End
     public static class MazesEnd {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             PhaseHandler ph = ai.getGame().getPhaseHandler();
             CardCollection availableGates = CardLists.filter(ai.getCardsIn(ZoneType.Library), CardPredicates.isType("Gate"));
 
-            return ph.is(PhaseType.END_OF_TURN) && ph.getNextTurn() == ai && !availableGates.isEmpty();
+            if (ph.is(PhaseType.END_OF_TURN) && ph.getNextTurn() == ai && !availableGates.isEmpty()) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            }
+
+            if (availableGates.isEmpty()) {
+                // No gates available, so don't activate Maze's End
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
+            }
+
+            return new AiAbilityDecision(0, AiPlayDecision.AnotherTime);
         }
 
         public static Card considerCardToGet(final Player ai, final SpellAbility sa)
@@ -1146,13 +1158,13 @@ public class SpecialCardAi {
 
     // Necropotence
     public static class Necropotence {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             Game game = ai.getGame();
             int computerHandSize = ai.getZone(ZoneType.Hand).size();
             int maxHandSize = ai.getMaxHandSize();
 
             if (ai.getCardsIn(ZoneType.Library).isEmpty()) {
-                return false; // nothing to draw from the library
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             if (ai.getCardsIn(ZoneType.Battlefield).anyMatch(CardPredicates.nameEquals("Yawgmoth's Bargain"))) {
@@ -1160,7 +1172,7 @@ public class SpecialCardAi {
 
                 // TODO: in presence of bad effects which deal damage when a card is drawn, probably better to prefer Necropotence instead?
                 // (not sure how to detect the presence of such effects yet)
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             PhaseHandler ph = game.getPhaseHandler();
@@ -1182,23 +1194,33 @@ public class SpecialCardAi {
                 // We're in a situation when we have nothing castable in hand, something needs to be done
                 if (!blackViseOTB) {
                     // exile-loot +1 card when at max hand size, hoping to get a workable spell or land
-                    return computerHandSize + exiledWithNecro - 1 == maxHandSize; 
+                    if (computerHandSize + exiledWithNecro - 1 == maxHandSize) {
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                    } else {
+                        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+                    }
                 } else {
                     // Loot to 7 in presence of Black Vise, hoping to find what to do
                     // NOTE: can still currently get theoretically locked with 7 uncastable spells. Loot to 8 instead?
-                    return computerHandSize + exiledWithNecro <= maxHandSize;
+                    if (computerHandSize + exiledWithNecro <= maxHandSize) {
+                        // Loot to 7, hoping to find something playable
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                    } else {
+                        // Loot to 8, hoping to find something playable
+                        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+                    }
                 }
             } else if (blackViseOTB && computerHandSize + exiledWithNecro - 1 >= 4) { 
                 // try not to overdraw in presence of Black Vise
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             } else if (computerHandSize + exiledWithNecro - 1 >= maxHandSize) {
                 // Only draw until we reach max hand size
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             } else if (!ph.isPlayerTurn(ai) || !ph.is(PhaseType.MAIN2)) {
                 // Only activate in AI's own turn (sans the exception above)
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.WaitForMain2);
             }
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
     }
 
@@ -1480,7 +1502,7 @@ public class SpecialCardAi {
 
     // Sorin, Vengeful Bloodlord
     public static class SorinVengefulBloodlord {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             int loyalty = sa.getHostCard().getCounters(CounterEnumType.LOYALTY);
             CardCollection creaturesToGet = CardLists.filter(ai.getCardsIn(ZoneType.Graveyard),
                     CardPredicates.CREATURES
@@ -1494,7 +1516,7 @@ public class SpecialCardAi {
             CardLists.sortByCmcDesc(creaturesToGet);
 
             if (creaturesToGet.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             // pick the best creature that will stay on the battlefield
@@ -1510,10 +1532,10 @@ public class SpecialCardAi {
                 sa.resetTargets();
                 sa.getTargets().add(best);
                 sa.setXManaCostPaid(best.getCMC());
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
 
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
     }
 
@@ -1627,23 +1649,27 @@ public class SpecialCardAi {
 
     // The One Ring
     public static class TheOneRing {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             if (!ai.canLoseLife() || ai.cantLoseForZeroOrLessLife()) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
 
             AiController aic = ((PlayerControllerAi) ai.getController()).getAi();
             int lifeInDanger = aic.getIntProperty(AiProps.AI_IN_DANGER_THRESHOLD);
             int numCtrs = sa.getHostCard().getCounters(CounterEnumType.BURDEN);
 
-            return ai.getLife() > numCtrs + 1 && ai.getLife() > lifeInDanger
-                    && ai.getMaxHandSize() >= ai.getCardsIn(ZoneType.Hand).size() + numCtrs + 1;
+            if (ai.getLife() > numCtrs + 1 && ai.getLife() > lifeInDanger
+                    && ai.getMaxHandSize() >= ai.getCardsIn(ZoneType.Hand).size() + numCtrs + 1) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            }
+
+            return new AiAbilityDecision(0, AiPlayDecision.LifeInDanger);
         }
     }
 
     // The Scarab God
     public static class TheScarabGod {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             Card bestOppCreat = ComputerUtilCard.getBestAI(CardLists.filter(ai.getOpponents().getCardsIn(ZoneType.Graveyard), CardPredicates.CREATURES));
             Card worstOwnCreat = ComputerUtilCard.getWorstAI(CardLists.filter(ai.getCardsIn(ZoneType.Graveyard), CardPredicates.CREATURES));
 
@@ -1654,13 +1680,19 @@ public class SpecialCardAi {
                 sa.getTargets().add(worstOwnCreat);
             }
 
-            return sa.getTargets().size() > 0;
+            if (!sa.getTargets().isEmpty()) {
+                // If we have a target, we can play this ability
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                // No valid targets, can't play this ability
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            }
         }
     }
 
     // Timetwister
     public static class Timetwister {
-        public static boolean consider(final Player ai, final SpellAbility sa) {
+        public static AiAbilityDecision consider(final Player ai, final SpellAbility sa) {
             final int aiHandSize = ai.getCardsIn(ZoneType.Hand).size();
             int maxOppHandSize = 0;
 
@@ -1674,7 +1706,14 @@ public class SpecialCardAi {
             }
 
             // use in case we're getting low on cards or if we're significantly behind our opponent in cards in hand
-            return aiHandSize < HAND_SIZE_THRESHOLD || maxOppHandSize - aiHandSize > HAND_SIZE_THRESHOLD;
+            if (aiHandSize < HAND_SIZE_THRESHOLD || maxOppHandSize - aiHandSize > HAND_SIZE_THRESHOLD) {
+                // if the AI has less than 3 cards in hand or the opponent has more than 3 cards in hand than the AI
+                // then the AI is willing to play this ability
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                // otherwise, don't play this ability
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            }
         }
     }
 

forge-ai/src/main/java/forge/ai/SpellAbilityAi.java

@@ -95,14 +95,15 @@ public abstract class SpellAbilityAi {
             return new AiAbilityDecision(0, AiPlayDecision.MissingPhaseRestrictions);
         }
 
-        if (!checkApiLogic(ai, sa)) {
-            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        AiAbilityDecision decision = checkApiLogic(ai, sa);
+        if (!decision.willingToPlay()) {
+            return decision;
         }
         // needs to be after API logic because needs to check possible X Cost?
         if (cost != null && !willPayCosts(ai, sa, cost, source)) {
             return new AiAbilityDecision(0, AiPlayDecision.CostNotAcceptable);
         }
-        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        return decision;
     }
 
     protected boolean checkConditions(final Player ai, final SpellAbility sa, SpellAbilityCondition con) {
@@ -169,12 +170,18 @@ public abstract class SpellAbilityAi {
     /**
      * The rest of the logic not covered by the canPlayAI template is defined here
      */
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
-        return MyRandom.getRandom().nextFloat() < .8f;
+        if (MyRandom.getRandom().nextFloat() < .8f) {
+            // 80% chance to play the ability
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        // 20% chance to not play the ability
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     public final boolean doTriggerAI(final Player aiPlayer, final SpellAbility sa, final boolean mandatory) {

forge-ai/src/main/java/forge/ai/ability/AlterAttributeAi.java

@@ -1,5 +1,7 @@
 package forge.ai.ability;
 
+import forge.ai.AiAbilityDecision;
+import forge.ai.AiPlayDecision;
 import forge.ai.SpellAbilityAi;
 import forge.game.ability.AbilityUtils;
 import forge.game.card.Card;
@@ -16,7 +18,7 @@ import java.util.Map;
 public class AlterAttributeAi extends SpellAbilityAi {
 
     @Override
-    protected boolean checkApiLogic(Player aiPlayer, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player aiPlayer, SpellAbility sa) {
         final Card source = sa.getHostCard();
         boolean activate = Boolean.parseBoolean(sa.getParamOrDefault("Activate", "true"));
         String[] attributes = sa.getParam("Attributes").split(",");
@@ -24,7 +26,7 @@ public class AlterAttributeAi extends SpellAbilityAi {
         if (sa.usesTargeting()) {
             // TODO add targeting logic
             // needed for Suspected
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         final List<Card> defined = AbilityUtils.getDefinedCards(source, sa.getParam("Defined"), sa);
@@ -36,7 +38,7 @@ public class AlterAttributeAi extends SpellAbilityAi {
                     case "Solved":
                         // there is currently no effect that would un-solve something
                         if (!c.isSolved() && activate) {
-                            return true;
+                            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                         }
                         break;
                     case "Suspect":
@@ -44,21 +46,21 @@ public class AlterAttributeAi extends SpellAbilityAi {
                         // is Suspected good or bad?
                         // currently Suspected is better
                         if (!activate) {
-                            return false;
+                            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                         }
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
 
                     case "Saddle":
                     case "Saddled":
                         // AI should not try to Saddle again?
                         if (c.isSaddled()) {
-                            return false;
+                            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                         }
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
         }
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/AmassAi.java

@@ -21,13 +21,19 @@ import java.util.Map;
 
 public class AmassAi extends SpellAbilityAi {
     @Override
-    protected boolean checkApiLogic(Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, final SpellAbility sa) {
         CardCollection aiArmies = CardLists.getType(ai.getCardsIn(ZoneType.Battlefield), "Army");
         Card host = sa.getHostCard();
         final Game game = ai.getGame();
 
         if (!aiArmies.isEmpty()) {
-            return aiArmies.anyMatch(CardPredicates.canReceiveCounters(CounterEnumType.P1P1));
+            if (aiArmies.anyMatch(CardPredicates.canReceiveCounters(CounterEnumType.P1P1))) {
+                // If AI has an Army that can receive counters, play the ability
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                // AI has Armies but none can receive counters, so don't play
+                return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactGame);
+            }
         }
         final String type = sa.getParam("Type");
         final String tokenScript = "b_0_0_" + sa.getOriginalParam("Type").toLowerCase() + "_army";
@@ -36,7 +42,7 @@ public class AmassAi extends SpellAbilityAi {
         Card token = TokenInfo.getProtoType(tokenScript, sa, ai, false);
 
         if (token == null) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         token.setController(ai, 0);
@@ -63,7 +69,11 @@ public class AmassAi extends SpellAbilityAi {
         //reset static abilities
         game.getAction().checkStaticAbilities(false);
 
-        return result;
+        if (result) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        }
     }
 
     @Override
@@ -83,8 +93,11 @@ public class AmassAi extends SpellAbilityAi {
 
     @Override
     protected AiAbilityDecision doTriggerAINoCost(Player ai, SpellAbility sa, boolean mandatory) {
-        boolean result = mandatory || checkApiLogic(ai, sa);
-        return result ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        if (mandatory) {
+            return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
+        }
+
+        return checkApiLogic(ai, sa);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/AnimateAi.java

@@ -142,21 +142,22 @@ public class AnimateAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(Player aiPlayer, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player aiPlayer, SpellAbility sa) {
         final Card source = sa.getHostCard();
         final Game game = aiPlayer.getGame();
         final PhaseHandler ph = game.getPhaseHandler();
         if (!sa.metConditions() && sa.getSubAbility() == null) {
-            return false; // what is this for?
+            return new AiAbilityDecision(0, AiPlayDecision.ConditionsNotMet); // what is this for?
         }
         if (!game.getStack().isEmpty() && game.getStack().peekAbility().getApi() == ApiType.Sacrifice) {
+            // Should I animate a card before i have to sacrifice something better?
             if (!isAnimatedThisTurn(aiPlayer, source)) {
                 rememberAnimatedThisTurn(aiPlayer, source);
-                return true;  // interrupt sacrifice
+                return new AiAbilityDecision(100, AiPlayDecision.ResponseToStackResolve);
             }
         }
         if (!ComputerUtilCost.checkTapTypeCost(aiPlayer, sa.getPayCosts(), source, sa, new CardCollection())) {
-            return false; // prevent crewing with equal or better creatures
+            return new AiAbilityDecision(0, AiPlayDecision.CostNotAcceptable); // prevent crewing with equal or better creatures
         }
 
         if (sa.costHasManaX() && sa.getSVar("X").equals("Count$xPaid")) {
@@ -202,16 +203,16 @@ public class AnimateAi extends SpellAbilityAi {
                 if (!isSorcerySpeed(sa, aiPlayer) && !"Permanent".equals(sa.getParam("Duration"))) {
                     if (sa.isCrew() && c.isCreature()) {
                         // Do not try to crew a vehicle which is already a creature
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                     }
                     Card animatedCopy = becomeAnimated(c, sa);
                     if (ph.isPlayerTurn(aiPlayer)
                             && !ComputerUtilCard.doesSpecifiedCreatureAttackAI(aiPlayer, animatedCopy)) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
                     }
                     if (ph.getPlayerTurn().isOpponentOf(aiPlayer)
                             && !ComputerUtilCard.doesSpecifiedCreatureBlock(aiPlayer, animatedCopy)) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
                     }
                     // also check if maybe there are static effects applied to the animated copy that would matter
                     // (e.g. Myth Realized)
@@ -227,11 +228,12 @@ public class AnimateAi extends SpellAbilityAi {
             }
             if (bFlag) {
                 rememberAnimatedThisTurn(aiPlayer, sa.getHostCard());
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
-            return bFlag; // All of the defined stuff is animated, not very useful
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         } else {
             sa.resetTargets();
-            return animateTgtAI(sa).willingToPlay();
+            return animateTgtAI(sa);
         }
 
     }

forge-ai/src/main/java/forge/ai/ability/AssembleContraptionAi.java

@@ -52,11 +52,11 @@ public class AssembleContraptionAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         if ("X".equals(sa.getParam("Amount")) && sa.getSVar("X").equals("Count$xPaid")) {
             int xPay = ComputerUtilCost.getMaxXValue(sa, ai, sa.isTrigger());
             if (xPay == 0) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
             sa.getRootAbility().setXManaCostPaid(xPay);
         }
@@ -66,7 +66,7 @@ public class AssembleContraptionAi extends SpellAbilityAi {
             if(target != null)
                 sa.getTargets().add(target);
             else
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         return super.checkApiLogic(ai, sa);

forge-ai/src/main/java/forge/ai/ability/ChangeTargetsAi.java

@@ -1,9 +1,6 @@
 package forge.ai.ability;
 
-import forge.ai.ComputerUtil;
-import forge.ai.ComputerUtilAbility;
-import forge.ai.ComputerUtilMana;
-import forge.ai.SpellAbilityAi;
+import forge.ai.*;
 import forge.card.mana.ManaCost;
 import forge.game.Game;
 import forge.game.card.Card;
@@ -21,7 +18,7 @@ public class ChangeTargetsAi extends SpellAbilityAi {
      * forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final Game game = sa.getHostCard().getGame();
         final SpellAbility topSa = game.getStack().isEmpty() ? null
                 : ComputerUtilAbility.getTopSpellAbilityOnStack(game, sa);
@@ -32,47 +29,50 @@ public class ChangeTargetsAi extends SpellAbilityAi {
 
         // The AI can't otherwise play this ability, but should at least not
         // miss mandatory activations (e.g. triggers).
-        return sa.isMandatory();
+        if (sa.isMandatory()) {
+            return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
+        }
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
-    private boolean doSpellMagnet(SpellAbility sa, SpellAbility topSa, Player aiPlayer) {
+    private AiAbilityDecision doSpellMagnet(SpellAbility sa, SpellAbility topSa, Player aiPlayer) {
         // For cards like Spellskite that retarget spells to itself
         if (topSa == null) {
             // nothing on stack, so nothing to target
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
         final TargetChoices topTargets = topSa.getTargets();
         final Card topHost = topSa.getHostCard();
 
-        if (sa.getTargets().size() != 0 && sa.isTrigger()) {
+        if (!sa.getTargets().isEmpty() && sa.isTrigger()) {
             // something was already chosen before (e.g. in response to a trigger - Mizzium Meddler), so just proceed
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         if (!topSa.usesTargeting() || topTargets.getTargetCards().contains(sa.getHostCard())) {
             // if this does not target at all or already targets host, no need to redirect it again
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         for (Card tgt : topTargets.getTargetCards()) {
             if (ComputerUtilAbility.getAbilitySourceName(sa).equals(tgt.getName()) && tgt.getController().equals(aiPlayer)) {
                 // We are already targeting at least one card with the same name (e.g. in presence of 2+ Spellskites),
                 // no need to retarget again to another one
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
         if (topHost != null && !topHost.getController().isOpponentOf(aiPlayer)) {
             // make sure not to redirect our own abilities
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
         if (!topSa.canTarget(sa.getHostCard())) {
             // don't try targeting it if we can't legally target the host card with it in the first place
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
         if (!sa.canTarget(topSa)) {
             // don't try retargeting a spell that the current card can't legally retarget (e.g. Muck Drubb + Lightning Bolt to the face)
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         if (sa.getPayCosts().getCostMana() != null && sa.getPayCosts().getCostMana().getMana().hasPhyrexian()) {
@@ -85,22 +85,22 @@ public class ChangeTargetsAi extends SpellAbilityAi {
             if (potentialDmg != -1 && potentialDmg <= payDamage && !canPay
                     && topTargets.contains(aiPlayer)) {
                 // do not pay Phyrexian mana if the spell is a damaging one but it deals less damage or the same damage as we'll pay life
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
         Card firstCard = topTargets.getFirstTargetedCard();
         // if we're not the target don't intervene unless we can steal a buff
         if (firstCard != null && !aiPlayer.equals(firstCard.getController()) && !topHost.getController().equals(firstCard.getController()) && !topHost.getController().getAllies().contains(firstCard.getController())) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
         Player firstPlayer = topTargets.getFirstTargetedPlayer();
         if (firstPlayer != null && !aiPlayer.equals(firstPlayer)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         sa.resetTargets();
         sa.getTargets().add(topSa);
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 }

forge-ai/src/main/java/forge/ai/ability/ChangeZoneAi.java

@@ -129,14 +129,14 @@ public class ChangeZoneAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(Player aiPlayer, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player aiPlayer, SpellAbility sa) {
         // Checks for "return true" unlike checkAiLogic()
 
         multipleCardsToChoose.clear();
         String aiLogic = sa.getParam("AILogic");
         if (aiLogic != null) {
             if (aiLogic.equals("Always")) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             } else if (aiLogic.startsWith("SacAndUpgrade")) { // Birthing Pod, Natural Order, etc.
                 return doSacAndUpgradeLogic(aiPlayer, sa);
             } else if (aiLogic.startsWith("SacAndRetFromGrave")) { // Recurring Nightmare, etc.
@@ -156,10 +156,18 @@ public class ChangeZoneAi extends SpellAbilityAi {
             } else if (aiLogic.equals("MazesEnd")) {
                 return SpecialCardAi.MazesEnd.consider(aiPlayer, sa);
             } else if (aiLogic.equals("Pongify")) {
-                return sa.isTargetNumberValid(); // Pre-targeted in checkAiLogic
+                if (sa.isTargetNumberValid()) {
+                    // Pre-targeted in checkAiLogic
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                } else {
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+                }
             } else if (aiLogic.equals("ReturnCastable")) {
-                return !sa.getHostCard().getExiledCards().isEmpty()
-                        && ComputerUtilMana.canPayManaCost(sa.getHostCard().getExiledCards().getFirst().getFirstSpellAbility(), aiPlayer, 0, false);
+                if (!sa.getHostCard().getExiledCards().isEmpty()
+                        && ComputerUtilMana.canPayManaCost(sa.getHostCard().getExiledCards().getFirst().getFirstSpellAbility(), aiPlayer, 0, false)) {
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                }
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
         if (sa.isHidden()) {
@@ -258,7 +266,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
      *            a {@link forge.game.spellability.SpellAbility} object.
      * @return a boolean.
      */
-    private static boolean hiddenOriginCanPlayAI(final Player ai, final SpellAbility sa) {
+    private static AiAbilityDecision hiddenOriginCanPlayAI(final Player ai, final SpellAbility sa) {
         // Fetching should occur fairly often as it helps cast more spells, and
         // have access to more mana
         final Cost abCost = sa.getPayCosts();
@@ -275,7 +283,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
             } catch (IllegalArgumentException ex) {
                 // This happens when Origin is something like
                 // "Graveyard,Library" (Doomsday)
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
         final String destination = sa.getParam("Destination");
@@ -284,11 +292,11 @@ public class ChangeZoneAi extends SpellAbilityAi {
             // AI currently disabled for these costs
             if (!ComputerUtilCost.checkSacrificeCost(ai, abCost, source, sa)
                     && !(destination.equals("Battlefield") && !source.isLand())) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CostNotAcceptable);
             }
 
             if (!ComputerUtilCost.checkLifeCost(ai, abCost, source, 4, sa)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantAfford);
             }
 
             if (!ComputerUtilCost.checkDiscardCost(ai, abCost, source, sa)) {
@@ -297,7 +305,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
                         CostDiscard cd = (CostDiscard) part;
                         // this is mainly for typecycling
                         if (!cd.payCostFromSource() || !ComputerUtil.isWorseThanDraw(ai, source)) {
-                            return false;
+                            return new AiAbilityDecision(0, AiPlayDecision.CantAfford);
                         }
                     }
                 }
@@ -305,14 +313,14 @@ public class ChangeZoneAi extends SpellAbilityAi {
 
             if (sa.isNinjutsu()) {
                 if (!source.ignoreLegendRule() && ai.isCardInPlay(source.getName())) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.WouldDestroyLegend);
                 }
                 if (ai.getGame().getPhaseHandler().getPhase().isAfter(PhaseType.COMBAT_DAMAGE)) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
                 }
 
                 if (ai.getGame().getCombat() == null) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
                 }
                 List<Card> attackers = ai.getGame().getCombat().getUnblockedAttackers();
                 boolean lowerCMC = false;
@@ -323,7 +331,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
                     }
                 }
                 if (!lowerCMC) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             }
         }
@@ -333,15 +341,15 @@ public class ChangeZoneAi extends SpellAbilityAi {
             final AbilitySub abSub = sa.getSubAbility();
             if (abSub != null && !sa.isWrapper() && "True".equals(source.getSVar("AIPlayForSub"))) {
                 if (!abSub.metConditions()) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.ConditionsNotMet);
                 }
             } else {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.ConditionsNotMet);
             }
         }
         // prevent run-away activations - first time will always return true
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         Iterable<Player> pDefined = Lists.newArrayList(source.getController());
@@ -355,7 +363,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
                 sa.getTargets().add(ai);
             }
             if (!sa.isTargetNumberValid()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
             pDefined = sa.getTargets().getTargetPlayers();
         } else {
@@ -399,12 +407,12 @@ public class ChangeZoneAi extends SpellAbilityAi {
             }
 
             if (!activateForCost && list.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
             if ("Atarka's Command".equals(sourceName)
                     && (list.size() < 2 || ai.getLandsPlayedThisTurn() < 1)) {
                 // be strict on playing lands off charms
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             String num = sa.getParamOrDefault("ChangeNum", "1");
@@ -412,55 +420,65 @@ public class ChangeZoneAi extends SpellAbilityAi {
                 if (sa.getSVar("X").equals("Count$xPaid")) {
                     // Set PayX here to maximum value.
                     int xPay = ComputerUtilCost.getMaxXValue(sa, ai, sa.isTrigger());
-                    if (xPay == 0) return false;
+                    if (xPay == 0) {
+                        return new AiAbilityDecision(0, AiPlayDecision.CantAffordX);
+                    }
                     xPay = Math.min(xPay, list.size());
                     sa.setXManaCostPaid(xPay);
                 } else {
                     // Figure out the X amount, bail if it's zero (nothing will change zone).
                     int xValue = AbilityUtils.calculateAmount(source, "X", sa);
                     if (xValue == 0) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.CantAffordX);
                     }
                 }
             }
 
             if (sourceName.equals("Temur Sabertooth")) {
                 // activated bounce + pump
-                if (ComputerUtilCard.shouldPumpCard(ai, sa.getSubAbility(), source, 0, 0, Arrays.asList("Indestructible")) ||
-                        ComputerUtilCard.canPumpAgainstRemoval(ai, sa.getSubAbility())) {
+                boolean pumpDecision = ComputerUtilCard.shouldPumpCard(ai, sa.getSubAbility(), source, 0, 0, Arrays.asList("Indestructible"));
+                AiAbilityDecision saveDecision = ComputerUtilCard.canPumpAgainstRemoval(ai, sa.getSubAbility());
+                if (pumpDecision || saveDecision.willingToPlay()) {
                     for (Card c : list) {
                         if (ComputerUtilCard.evaluateCreature(c) < ComputerUtilCard.evaluateCreature(source)) {
-                            return true;
+                            return new AiAbilityDecision(100, AiPlayDecision.ResponseToStackResolve);
                         }
                     }
                 }
-                return canBouncePermanent(ai, sa, list) != null;
+                if (canBouncePermanent(ai, sa, list) != null) {
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                }
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
         if (ComputerUtil.playImmediately(ai, sa)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         // don't use fetching to top of library/graveyard before main2
         if (ai.getGame().getPhaseHandler().getPhase().isBefore(PhaseType.MAIN2)
                 && !sa.hasParam("ActivationPhases")) {
             if (!destination.equals("Battlefield") && !destination.equals("Hand")) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
             // Only tutor something in main1 if hand is almost empty
             if (ai.getCardsIn(ZoneType.Hand).size() > 1 && destination.equals("Hand")
                     && !aiLogic.equals("AnyMainPhase")) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
         if (ComputerUtil.waitForBlocking(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
         }
 
         final AbilitySub subAb = sa.getSubAbility();
-        return subAb == null || SpellApiToAi.Converter.get(subAb).chkDrawbackWithSubs(ai, subAb).willingToPlay();
+        if (subAb == null) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        return SpellApiToAi.Converter.get(subAb).chkDrawbackWithSubs(ai, subAb);
     }
 
     /**
@@ -681,7 +699,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
      *            a {@link forge.game.spellability.SpellAbility} object.
      * @return a boolean.
      */
-    private static boolean knownOriginCanPlayAI(final Player ai, final SpellAbility sa) {
+    private static AiAbilityDecision knownOriginCanPlayAI(final Player ai, final SpellAbility sa) {
         // Retrieve either this card, or target Cards in Graveyard
 
         final List<ZoneType> origin = Lists.newArrayList();
@@ -694,19 +712,19 @@ public class ChangeZoneAi extends SpellAbilityAi {
         final ZoneType destination = ZoneType.smartValueOf(sa.getParam("Destination"));
 
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if (sa.usesTargeting()) {
             if (!isPreferredTarget(ai, sa, false, false)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
         } else {
             // non-targeted retrieval
             final List<Card> retrieval = sa.knownDetermineDefined(sa.getParam("Defined"));
 
             if (retrieval == null || retrieval.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             // return this card from graveyard: cards like Hammer of Bogardan
@@ -717,7 +735,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
             // (dying or losing control of)
             if (origin.contains(ZoneType.Battlefield)) {
                 if (ai.getGame().getStack().isEmpty()) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
 
                 final AbilitySub abSub = sa.getSubAbility();
@@ -730,7 +748,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
                 if (!(destination.equals(ZoneType.Exile)
                         && (subApi == ApiType.DelayedTrigger || subApi == ApiType.ChangeZone || "DelayedBlink".equals(sa.getParam("AILogic"))))
                         && !destination.equals(ZoneType.Hand)) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
 
                 final List<GameObject> objects = ComputerUtil.predictThreatenedObjects(ai, sa);
@@ -742,13 +760,13 @@ public class ChangeZoneAi extends SpellAbilityAi {
                     }
                 }
                 if (!contains) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             }
 
             if (destination == ZoneType.Battlefield) {
                 if (ComputerUtil.isETBprevented(retrieval.get(0))) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
 
                 // predict whether something may put a ETBing creature below zero toughness
@@ -758,7 +776,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
                         final Card copy = CardCopyService.getLKICopy(c);
                         ComputerUtilCard.applyStaticContPT(c.getGame(), copy, null);
                         if (copy.getNetToughness() <= 0) {
-                            return false;
+                            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                         }
                     }
                 }
@@ -772,13 +790,17 @@ public class ChangeZoneAi extends SpellAbilityAi {
                     }
                 }
                 if (nothingWillReturn) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             }
         }
 
         final AbilitySub subAb = sa.getSubAbility();
-        return subAb == null || SpellApiToAi.Converter.get(subAb).chkDrawbackWithSubs(ai, subAb).willingToPlay();
+        if (subAb == null) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        return SpellApiToAi.Converter.get(subAb).chkDrawbackWithSubs(ai, subAb);
     }
 
     /*
@@ -1816,7 +1838,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
         return super.chooseSingleAttackableEntity(ai, sa, options, params);
     }
 
-    private boolean doSacAndReturnFromGraveLogic(final Player ai, final SpellAbility sa) {
+    private AiAbilityDecision doSacAndReturnFromGraveLogic(final Player ai, final SpellAbility sa) {
         Card source = sa.getHostCard();
         String definedSac = StringUtils.split(source.getSVar("AIPreference"), "$")[1];
 
@@ -1835,14 +1857,14 @@ public class ChangeZoneAi extends SpellAbilityAi {
                 sa.resetTargets();
                 sa.getTargets().add(bestRet);
                 source.setSVar("AIPreferenceOverride", "Creature.cmcEQ" + worstSac.getCMC());
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         }
 
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
     }
 
-    private boolean doSacAndUpgradeLogic(final Player ai, final SpellAbility sa) {
+    private AiAbilityDecision doSacAndUpgradeLogic(final Player ai, final SpellAbility sa) {
         Card source = sa.getHostCard();
         PhaseHandler ph = ai.getGame().getPhaseHandler();
         String logic = sa.getParam("AILogic");
@@ -1850,7 +1872,7 @@ public class ChangeZoneAi extends SpellAbilityAi {
 
         if (!ph.is(PhaseType.MAIN2)) {
             // Should be given a chance to cast other spells as well as to use a previously upgraded creature
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WaitForMain2);
         }
 
         String definedSac = StringUtils.split(source.getSVar("AIPreference"), "$")[1];
@@ -1889,12 +1911,11 @@ public class ChangeZoneAi extends SpellAbilityAi {
             if (!listGoal.isEmpty()) {
                 // make sure we're upgrading sacCMC->goalCMC
                 source.setSVar("AIPreferenceOverride", "Creature.cmcEQ" + sacCMC);
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         }
 
-        // no candidates to upgrade
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     public AiAbilityDecision doReturnCommanderLogic(SpellAbility sa, Player aiPlayer) {

forge-ai/src/main/java/forge/ai/ability/ChangeZoneAllAi.java

@@ -69,11 +69,9 @@ public class ChangeZoneAllAi extends SpellAbilityAi {
         computerType = AbilityUtils.filterListByType(computerType, sa.getParam("ChangeType"), sa);
         
         if ("LivingDeath".equals(aiLogic)) {
-            boolean result = SpecialCardAi.LivingDeath.consider(ai, sa);
-            return result ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            return SpecialCardAi.LivingDeath.consider(ai, sa);
         } else if ("Timetwister".equals(aiLogic)) {
-            boolean result = SpecialCardAi.Timetwister.consider(ai, sa);
-            return result ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            return SpecialCardAi.Timetwister.consider(ai, sa);
         } else if ("RetDiscardedThisTurn".equals(aiLogic)) {
             boolean result = !ai.getDiscardedThisTurn().isEmpty() && ai.getGame().getPhaseHandler().is(PhaseType.END_OF_TURN);
             return result ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);

forge-ai/src/main/java/forge/ai/ability/CharmAi.java

@@ -18,7 +18,7 @@ import java.util.Map;
 
 public class CharmAi extends SpellAbilityAi {
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final Card source = sa.getHostCard();
         List<AbilitySub> choices = CharmEffect.makePossibleOptions(sa);
 
@@ -70,10 +70,10 @@ public class CharmAi extends SpellAbilityAi {
                 // Set minimum choices for triggers where chooseMultipleOptionsAi() returns null
                 chosenList = chooseOptionsAi(sa, choices, ai, true, num, min);
                 if (chosenList.isEmpty() && min != 0) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             } else {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
@@ -81,7 +81,7 @@ public class CharmAi extends SpellAbilityAi {
         sa.setChosenList(chosenList);
 
         if (choiceForOpp) {
-            return true;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         if (sa.isSpell()) {
@@ -90,7 +90,11 @@ public class CharmAi extends SpellAbilityAi {
         }
 
         // prevent run-away activations - first time will always return true
-        return MyRandom.getRandom().nextFloat() <= Math.pow(.6667, sa.getActivationsThisTurn());
+        if (MyRandom.getRandom().nextFloat() <= Math.pow(.6667, sa.getActivationsThisTurn())) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     private List<AbilitySub> chooseOptionsAi(SpellAbility sa, List<AbilitySub> choices, final Player ai, boolean isTrigger, int num, int min) {

forge-ai/src/main/java/forge/ai/ability/ChooseCardAi.java

@@ -26,19 +26,19 @@ public class ChooseCardAi extends SpellAbilityAi {
      * The rest of the logic not covered by the canPlayAI template is defined here
      */
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         if (sa.usesTargeting()) {
             sa.resetTargets();
             // search targetable Opponents
             final List<Player> oppList = ai.getOpponents().filter(PlayerPredicates.isTargetableBy(sa));
 
             if (oppList.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             sa.getTargets().add(Iterables.getFirst(oppList, null));
         }
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     /**
@@ -140,11 +140,7 @@ public class ChooseCardAi extends SpellAbilityAi {
             return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
-        if (checkApiLogic(ai, sa)) {
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
-        } else {
-            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
-        }
+        return checkApiLogic(ai, sa);
     }
 
     protected boolean checkPhaseRestrictions(Player ai, SpellAbility sa, PhaseHandler ph) {

forge-ai/src/main/java/forge/ai/ability/ChooseGenericAi.java

@@ -43,8 +43,13 @@ public class ChooseGenericAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
-        return sa.hasParam("AILogic");
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
+        if (sa.hasParam("AILogic")) {
+            // This is equivilant to what was here before but feels bad
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     /* (non-Javadoc)
@@ -52,10 +57,14 @@ public class ChooseGenericAi extends SpellAbilityAi {
      */
     @Override
     public AiAbilityDecision chkAIDrawback(SpellAbility sa, Player aiPlayer) {
-        boolean result = sa.isTrigger()
-            ? doTriggerAINoCost(aiPlayer, sa, sa.isMandatory()).willingToPlay()
-            : checkApiLogic(aiPlayer, sa);
-        return result ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        AiAbilityDecision decision;
+        if (sa.isTrigger()) {
+            decision = doTriggerAINoCost(aiPlayer, sa, sa.isMandatory());
+        } else {
+            decision = checkApiLogic(aiPlayer, sa);
+        }
+
+        return decision;
     }
 
     @Override
@@ -73,8 +82,7 @@ public class ChooseGenericAi extends SpellAbilityAi {
         if (ComputerUtilAbility.getAbilitySourceName(sa).equals("Deathmist Raptor")) {
             return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
-        AiAbilityDecision superDecision = super.doTriggerAINoCost(aiPlayer, sa, mandatory);
-        return superDecision;
+        return super.doTriggerAINoCost(aiPlayer, sa, mandatory);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/ClashAi.java

@@ -42,14 +42,17 @@ public class ClashAi extends SpellAbilityAi {
      * forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         boolean legalAction = true;
 
         if (sa.usesTargeting()) {
             legalAction = selectTarget(ai, sa);
+            if (!legalAction) {
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            }
         }
 
-        return legalAction;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     /*

forge-ai/src/main/java/forge/ai/ability/CountersMoveAi.java

@@ -19,20 +19,25 @@ import java.util.Map;
 
 public class CountersMoveAi extends SpellAbilityAi {
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
+        AiAbilityDecision decision = new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         if (sa.usesTargeting()) {
             sa.resetTargets();
-            AiAbilityDecision decision = moveTgtAI(ai, sa);
+            decision = moveTgtAI(ai, sa);
             if (!decision.willingToPlay()) {
-                return false;
+                return decision;
             }
         }
 
         if (!playReusable(ai, sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
-        return MyRandom.getRandom().nextFloat() < .8f; // random success
+        if (MyRandom.getRandom().nextFloat() < .8f) {
+            return decision;
+        }
+
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/CountersMultiplyAi.java

@@ -19,7 +19,7 @@ import java.util.Map;
 public class CountersMultiplyAi extends SpellAbilityAi {
 
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final CounterType counterType = getCounterType(sa);
 
         if (!sa.usesTargeting()) {
@@ -51,7 +51,7 @@ public class CountersMultiplyAi extends SpellAbilityAi {
             });
 
             if (list.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
             }
         } else {
             return setTargets(ai, sa);
@@ -87,8 +87,10 @@ public class CountersMultiplyAi extends SpellAbilityAi {
         if (!sa.usesTargeting()) {
             return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
-        if (setTargets(ai, sa)) {
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+
+        AiAbilityDecision decision = setTargets(ai, sa);
+        if (decision.willingToPlay()) {
+            return decision;
         } else if (mandatory) {
             CardCollection list = CardLists.getTargetableCards(ai.getGame().getCardsIn(ZoneType.Battlefield), sa);
             if (list.isEmpty()) {
@@ -98,7 +100,7 @@ public class CountersMultiplyAi extends SpellAbilityAi {
                     .filter(CardPredicates.hasCounters().negate())
                     .findFirst().orElse(null);
             sa.getTargets().add(safeMatch == null ? list.getFirst() : safeMatch);
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
         }
 
         return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
@@ -116,7 +118,7 @@ public class CountersMultiplyAi extends SpellAbilityAi {
         return null;
     }
 
-    private boolean setTargets(Player ai, SpellAbility sa) {
+    private AiAbilityDecision setTargets(Player ai, SpellAbility sa) {
         final CounterType counterType = getCounterType(sa);
 
         final Game game = ai.getGame();
@@ -172,10 +174,10 @@ public class CountersMultiplyAi extends SpellAbilityAi {
         // targeting does failed
         if (!sa.isTargetNumberValid() || sa.getTargets().size() == 0) {
             sa.resetTargets();
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     private void addTargetsByCounterType(final Player ai, final SpellAbility sa, final CardCollection list,

forge-ai/src/main/java/forge/ai/ability/CountersProliferateAi.java

@@ -16,7 +16,7 @@ import java.util.Map;
 public class CountersProliferateAi extends SpellAbilityAi {
 
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final List<Card> cperms = Lists.newArrayList();
         boolean allyExpOrEnergy = false;
 
@@ -68,7 +68,13 @@ public class CountersProliferateAi extends SpellAbilityAi {
             }));
         }
 
-        return !cperms.isEmpty() || !hperms.isEmpty() || opponentPoison || allyExpOrEnergy;
+        if (!cperms.isEmpty() || !hperms.isEmpty() || opponentPoison || allyExpOrEnergy) {
+            // AI will play it if there are any counters to proliferate
+            // or if there are no counters, but AI has experience or energy counters
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     @Override
@@ -92,11 +98,7 @@ public class CountersProliferateAi extends SpellAbilityAi {
             return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
-        if (checkApiLogic(ai, sa)) {
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
-        }
-
-        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        return checkApiLogic(ai, sa);
     }
 
     /*

forge-ai/src/main/java/forge/ai/ability/CountersPutAi.java

@@ -118,7 +118,7 @@ public class CountersPutAi extends CountersAi {
     }
 
     @Override
-    protected boolean checkApiLogic(Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, final SpellAbility sa) {
         // AI needs to be expanded, since this function can be pretty complex
         // based on what the expected targets could be
         final Cost abCost = sa.getPayCosts();
@@ -159,7 +159,7 @@ public class CountersPutAi extends CountersAi {
                     PlayerCollection poisonList = oppList.filter(PlayerPredicates.hasCounter(CounterEnumType.POISON, 9));
                     if (!poisonList.isEmpty()) {
                         sa.getTargets().add(poisonList.max(PlayerPredicates.compareByLife()));
-                        return true;
+                        return new AiAbilityDecision(1000, AiPlayDecision.WillPlay);
                     }
                 }
 
@@ -175,7 +175,7 @@ public class CountersPutAi extends CountersAi {
                     Card best = ComputerUtilCard.getBestAI(oppCreatM1);
                     if (best != null) {
                         sa.getTargets().add(best);
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
 
                     CardCollection aiCreat = CardLists.getTargetableCards(ai.getCreaturesInPlay(), sa);
@@ -195,7 +195,7 @@ public class CountersPutAi extends CountersAi {
                     best = ComputerUtilCard.getBestAI(aiCreat);
                     if (best != null) {
                         sa.getTargets().add(best);
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
                 }
 
@@ -204,28 +204,28 @@ public class CountersPutAi extends CountersAi {
                     if (!ai.getCounters().isEmpty()) {
                         if (!eachExisting || ai.getPoisonCounters() < 5) {
                             sa.getTargets().add(ai);
-                            return true;
+                            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                         }
                     }
                 }
 
             }
 
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if ("Never".equals(logic)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         } else if ("AlwaysWithNoTgt".equals(logic)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         } else if ("AristocratCounters".equals(logic)) {
             return SpecialAiLogic.doAristocratWithCountersLogic(ai, sa);
         } else if ("PayEnergy".equals(logic)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         } else if ("PayEnergyConservatively".equals(logic)) {
             boolean onlyInCombat = ai.getController().isAI()
                     && ((PlayerControllerAi) ai.getController()).getAi().getBooleanProperty(AiProps.CONSERVATIVE_ENERGY_PAYMENT_ONLY_IN_COMBAT);
@@ -234,10 +234,10 @@ public class CountersPutAi extends CountersAi {
 
             if (playAggro) {
                 // aggro profiles ignore conservative play for this AI logic
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             } else if (ph.inCombat() && source != null) {
                 if (ai.getGame().getCombat().isAttacking(source) && !onlyDefensive) {
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
                 } else if (ai.getGame().getCombat().isBlocking(source)) {
                     // when blocking, consider this if it's possible to save the blocker and/or kill at least one attacker
                     CardCollection blocked = ai.getGame().getCombat().getAttackersBlockedBy(source);
@@ -247,7 +247,7 @@ public class CountersPutAi extends CountersAi {
                     int numActivations = ai.getCounters(CounterEnumType.ENERGY) / sa.getPayCosts().getCostEnergy().convertAmount();
                     if (source.getNetToughness() + numActivations > totBlkPower
                             || source.getNetPower() + numActivations >= totBlkToughness) {
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
                     }
                 }
             } else if (sa.getSubAbility() != null
@@ -257,18 +257,18 @@ public class CountersPutAi extends CountersAi {
                     // Bristling Hydra: save from death using a ping activation
                     if (ComputerUtil.predictThreatenedObjects(sa.getActivatingPlayer(), sa).contains(source)) {
                         AiCardMemory.rememberCard(ai, source, AiCardMemory.MemorySet.ACTIVATED_THIS_TURN);
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
             } else if (ai.getCounters(CounterEnumType.ENERGY) > ComputerUtilCard.getMaxSAEnergyCostOnBattlefield(ai) + sa.getPayCosts().getCostEnergy().convertAmount()) {
                 // outside of combat, this logic only works if the relevant AI profile option is enabled
                 // and if there is enough energy saved
                 if (!onlyInCombat) {
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
         } else if (logic.equals("MarkOppCreature")) {
             if (!ph.is(PhaseType.END_OF_TURN)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.WaitForEndOfTurn);
             }
 
             Predicate<Card> predicate = CardPredicates.hasCounter(CounterType.getType(type));
@@ -280,12 +280,12 @@ public class CountersPutAi extends CountersAi {
                 Card bestCreat = ComputerUtilCard.getBestCreatureAI(oppCreats);
                 sa.resetTargets();
                 sa.getTargets().add(bestCreat);
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         } else if (logic.equals("CheckDFC")) {
             // for cards like Ludevic's Test Subject
             if (!source.canTransform(null)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         } else if (logic.startsWith("MoveCounter")) {
             return doMoveCounterLogic(ai, sa, ph);
@@ -294,8 +294,15 @@ public class CountersPutAi extends CountersAi {
             if (willActivate && ph.getPhase().isBefore(PhaseType.MAIN2)) {
                 // don't use this for mana until after combat
                 AiCardMemory.rememberCard(ai, source, AiCardMemory.MemorySet.HELD_MANA_SOURCES_FOR_MAIN2);
+                return new AiAbilityDecision(25, AiPlayDecision.WaitForMain2);
             }
-            return willActivate;
+
+            if (willActivate) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            }
+
         } else if (logic.equals("ChargeToBestCMC")) {
             return doChargeToCMCLogic(ai, sa);
         } else if (logic.equals("ChargeToBestOppControlledCMC")) {
@@ -305,14 +312,14 @@ public class CountersPutAi extends CountersAi {
         }
 
         if (!sa.metConditions() && sa.getSubAbility() == null) {
-            return false;
+            return new AiAbilityDecision(100, AiPlayDecision.ConditionsNotMet);
         }
 
         if (sourceName.equals("Feat of Resistance")) { // sub-ability should take precedence
             CardCollection prot = ProtectAi.getProtectCreatures(ai, sa.getSubAbility());
             if (!prot.isEmpty()) {
                 sa.getTargets().add(prot.get(0));
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
             }
         }
 
@@ -320,13 +327,13 @@ public class CountersPutAi extends CountersAi {
             CardCollection creatsYouCtrl = ai.getCreaturesInPlay();
             List<Card> leastToughness = Aggregates.listWithMin(creatsYouCtrl, Card::getNetToughness);
             if (leastToughness.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
             }
             // TODO If Creature that would be Bolstered for some reason is useless, also return False
         }
 
         if (sa.hasParam("Monstrosity") && source.isMonstrous()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         // TODO handle proper calculation of X values based on Cost
@@ -341,7 +348,7 @@ public class CountersPutAi extends CountersAi {
             Combat combat = game.getCombat();
 
             if (!source.canReceiveCounters(CounterType.get(CounterEnumType.P1P1)) || source.getCounters(CounterEnumType.P1P1) > 0) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             } else if (combat != null && ph.is(PhaseType.COMBAT_DECLARE_BLOCKERS)) {
                 return doCombatAdaptLogic(source, amount, combat);
             }
@@ -368,12 +375,12 @@ public class CountersPutAi extends CountersAi {
 
                     // This will "rewind" clockwork cards when they fall to 50% power or below, consider improving
                     if (curCtrs > Math.ceil(maxCtrs / 2.0)) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                     }
 
                     amount = Math.min(amount, maxCtrs - curCtrs);
                     if (amount <= 0) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                     }
                 }
 
@@ -385,14 +392,14 @@ public class CountersPutAi extends CountersAi {
                         .mapToInt(Card::getCMC)
                         .max().orElse(0);
                 if (amount > 0 && ai.getGame().getPhaseHandler().is(PhaseType.END_OF_TURN)) {
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
         }
 
         // don't use it if no counters to add
         if (amount <= 0) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         if ("Polukranos".equals(logic)) {
@@ -419,20 +426,20 @@ public class CountersPutAi extends CountersAi {
                         }
                     }
                     if (!canSurvive) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                     }
                 }
                 found = true;
                 break;
             }
             if (!found) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
         if ("AtOppEOT".equals(logic)) {
             if (ph.is(PhaseType.END_OF_TURN) && ph.getNextTurn().equals(ai)) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         }
 
@@ -443,17 +450,19 @@ public class CountersPutAi extends CountersAi {
             if (!ai.getGame().getStack().isEmpty() && !isSorcerySpeed(sa, ai)) {
                 // only evaluates case where all tokens are placed on a single target
                 if (sa.getMinTargets() < 2) {
-                    if (ComputerUtilCard.canPumpAgainstRemoval(ai, sa)) {
+                    AiAbilityDecision decision = ComputerUtilCard.canPumpAgainstRemoval(ai, sa);
+                    if (decision.willingToPlay()) {
                         Card c = sa.getTargetCard();
                         if (sa.getTargets().size() > 1) {
                             sa.resetTargets();
                             sa.getTargets().add(c);
                         }
                         sa.addDividedAllocation(c, amount);
-                        return true;
+                        return decision;
                     } else {
-                        if (!hasSacCost) { // for Sacrifice costs, evaluate further to see if it's worth using the ability before the card dies
-                            return false;
+                        if (!hasSacCost) {
+                            // for Sacrifice costs, evaluate further to see if it's worth using the ability before the card dies
+                            return decision;
                         }
                     }
                 }
@@ -497,7 +506,7 @@ public class CountersPutAi extends CountersAi {
             }
 
             if (list.size() < sa.getTargetRestrictions().getMinTargets(source, sa)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
 
             // Activate +Loyalty planeswalker abilities even if they have no target (e.g. Vivien of the Arkbow),
@@ -506,9 +515,9 @@ public class CountersPutAi extends CountersAi {
                     && sa.isPwAbility()
                     && sa.getPayCosts().hasOnlySpecificCostType(CostPutCounter.class)
                     && sa.isTargetNumberValid()
-                    && sa.getTargets().size() == 0
+                    && sa.getTargets().isEmpty()
                     && ai.getGame().getPhaseHandler().is(PhaseType.MAIN2, ai)) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
 
             if (sourceName.equals("Abzan Charm")) {
@@ -530,11 +539,11 @@ public class CountersPutAi extends CountersAi {
                         }
                     }
                     if (left == 0) {
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
                     sa.resetTargets();
                 }
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
 
             // target loop
@@ -542,7 +551,7 @@ public class CountersPutAi extends CountersAi {
                 if (list.isEmpty()) {
                     if (!sa.isTargetNumberValid() || sa.getTargets().isEmpty()) {
                         sa.resetTargets();
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                     } else {
                         // TODO is this good enough? for up to amounts?
                         break;
@@ -574,10 +583,9 @@ public class CountersPutAi extends CountersAi {
                                 // check if other choice will already be played
                                 increasesCharmOutcome = !choices.get(0).getTargets().isEmpty(); 
                             }
-                            if (!source.isSpell() || increasesCharmOutcome // does not cost a card or can buff charm for no expense
+                            if (source != null && !source.isSpell() || increasesCharmOutcome // does not cost a card or can buff charm for no expense
                                     || ph.getTurn() - source.getTurnInZone() >= source.getGame().getPlayers().size() * 2) {
-                                if (abCost == null || abCost == Cost.Zero
-                                        || (ph.is(PhaseType.END_OF_TURN) && ph.getPlayerTurn().isOpponentOf(ai))) {
+                                if (abCost == Cost.Zero || ph.is(PhaseType.END_OF_TURN) && ph.getPlayerTurn().isOpponentOf(ai)) {
                                     // only use at opponent EOT unless it is free
                                     choice = chooseBoonTarget(list, type);
                                 }
@@ -591,7 +599,7 @@ public class CountersPutAi extends CountersAi {
                 if (choice == null) { // can't find anything left
                     if (!sa.isTargetNumberValid() || sa.getTargets().isEmpty()) {
                         sa.resetTargets();
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                     } else {
                         // TODO is this good enough? for up to amounts?
                         break;
@@ -607,14 +615,14 @@ public class CountersPutAi extends CountersAi {
                 choice = null;
             }
             if (sa.getTargets().isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
         } else {
             final List<Card> cards = AbilityUtils.getDefinedCards(source, sa.getParam("Defined"), sa);
             // Don't activate Curse abilities on my cards and non-curse abilities
             // on my opponents
             if (cards.isEmpty() || (cards.get(0).getController().isOpponentOf(ai) && !sa.isCurse())) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
             }
 
             final int currCounters = cards.get(0).getCounters(CounterType.get(type));
@@ -622,46 +630,46 @@ public class CountersPutAi extends CountersAi {
             // activating this ability.
 
             if (!(type.equals("P1P1") || type.equals("M1M1") || type.equals("ICE")) && (MyRandom.getRandom().nextFloat() < (.1 * currCounters))) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
             // Instant +1/+1
             if (type.equals("P1P1") && !isSorcerySpeed(sa, ai)) {
                 if (!hasSacCost && !(ph.getNextTurn() == ai && ph.is(PhaseType.END_OF_TURN) && abCost.isReusuableResource())) {
-                    return false; // only if next turn and cost is reusable
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             }
 
             // Useless since the card already has the keyword (or for another reason)
             if (ComputerUtil.isUselessCounter(CounterType.get(type), cards.get(0))) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
         boolean immediately = ComputerUtil.playImmediately(ai, sa);
 
-        if (abCost != null && !ComputerUtilCost.checkSacrificeCost(ai, abCost, source, sa, immediately)) {
-            return false;
+        if (!ComputerUtilCost.checkSacrificeCost(ai, abCost, source, sa, immediately)) {
+            return new AiAbilityDecision(0, AiPlayDecision.CantAfford);
         }
 
         if (immediately) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         if (!type.equals("P1P1") && !type.equals("M1M1") && !sa.hasParam("ActivationPhases")) {
             // Don't use non P1P1/M1M1 counters before main 2 if possible
             if (ph.getPhase().isBefore(PhaseType.MAIN2) && !ComputerUtil.castSpellInMain1(ai, sa)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.WaitForMain2);
             }
             if (ph.isPlayerTurn(ai) && !isSorcerySpeed(sa, ai)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.AnotherTime);
             }
         }
 
         if (ComputerUtil.waitForBlocking(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
         }
 
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     @Override
@@ -772,17 +780,25 @@ public class CountersPutAi extends CountersAi {
         }
 
         if ("ChargeToBestCMC".equals(aiLogic)) {
-            if (doChargeToCMCLogic(ai, sa) || mandatory) {
+            AiAbilityDecision decision = doChargeToCMCLogic(ai, sa);
+            if (decision.willingToPlay()) {
                 // If the AI logic is to charge to best CMC, we can return true
                 // if the logic was successfully applied or if it's mandatory.
-                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                return decision;
+            } else if (mandatory) {
+                // If the logic was not applied and it's mandatory, we return false.
+                return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
             } else {
                 // If the logic was not applied and it's not mandatory, we return false.
                 return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         } else if ("ChargeToBestOppControlledCMC".equals(aiLogic)) {
-            if (doChargeToOppCtrlCMCLogic(ai, sa) || mandatory) {
+            AiAbilityDecision decision = doChargeToOppCtrlCMCLogic(ai, sa);
+            if (decision.willingToPlay()) {
                 return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else if (mandatory) {
+                // If the logic was not applied and it's mandatory, we return false.
+                return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
             } else {
                 return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
@@ -830,8 +846,9 @@ public class CountersPutAi extends CountersAi {
                 if (type.equals("P1P1")) {
                     nPump = amount;
                 }
-                if (FightAi.canFightAi(ai, sa, nPump, nPump)) {
-                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                AiAbilityDecision decision = FightAi.canFightAi(ai, sa, nPump, nPump);
+                if (decision.willingToPlay()) {
+                    return decision;
                 }
             }
 
@@ -1135,7 +1152,7 @@ public class CountersPutAi extends CountersAi {
         return Iterables.getFirst(options, null);
     }
 
-    private boolean doMoveCounterLogic(final Player ai, SpellAbility sa, PhaseHandler ph) {
+    private AiAbilityDecision doMoveCounterLogic(final Player ai, SpellAbility sa, PhaseHandler ph) {
         // Spikes (Tempest)
 
         // Try not to do it unless at the end of opponent's turn or the creature is threatened
@@ -1148,7 +1165,7 @@ public class CountersPutAi extends CountersAi {
                 || (combat.isBlocking(source) && ComputerUtilCombat.blockerWouldBeDestroyed(ai, source, combat) && !ComputerUtilCombat.willKillAtLeastOne(ai, source, combat))));
 
         if (!(threatened || (ph.is(PhaseType.END_OF_TURN) && ph.getNextTurn() == ai))) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.AnotherTime);
         }
 
         CardCollection targets = CardLists.getTargetableCards(ai.getCreaturesInPlay(), sa);
@@ -1166,45 +1183,45 @@ public class CountersPutAi extends CountersAi {
 
         if (bestTgt != null) {
             sa.getTargets().add(bestTgt);
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
     }
 
-    private boolean doCombatAdaptLogic(Card source, int amount, Combat combat) {
+    private AiAbilityDecision doCombatAdaptLogic(Card source, int amount, Combat combat) {
         if (combat.isAttacking(source)) {
             if (!combat.isBlocked(source)) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             } else {
                 for (Card blockedBy : combat.getBlockers(source)) {
                     if (blockedBy.getNetToughness() > source.getNetPower()
                             && blockedBy.getNetToughness() <= source.getNetPower() + amount) {
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
                 }
 
                 int totBlkPower = Aggregates.sum(combat.getBlockers(source), Card::getNetPower);
                 if (source.getNetToughness() <= totBlkPower
                         && source.getNetToughness() + amount > totBlkPower) {
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
                 }
             }
         } else if (combat.isBlocking(source)) {
             for (Card blocked : combat.getAttackersBlockedBy(source)) {
                 if (blocked.getNetToughness() > source.getNetPower()
                         && blocked.getNetToughness() <= source.getNetPower() + amount) {
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.ImpactCombat);
                 }
             }
 
             int totAtkPower = Aggregates.sum(combat.getAttackersBlockedBy(source), Card::getNetPower);
             if (source.getNetToughness() <= totAtkPower
                     && source.getNetToughness() + amount > totAtkPower) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         }
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     @Override
@@ -1215,7 +1232,7 @@ public class CountersPutAi extends CountersAi {
         return max;
     }
 
-    private boolean doChargeToCMCLogic(Player ai, SpellAbility sa) {
+    private AiAbilityDecision doChargeToCMCLogic(Player ai, SpellAbility sa) {
         Card source = sa.getHostCard();
         CardCollectionView ownLib = CardLists.filter(ai.getCardsIn(ZoneType.Library), CardPredicates.CREATURES);
         int numCtrs = source.getCounters(CounterEnumType.CHARGE);
@@ -1230,10 +1247,16 @@ public class CountersPutAi extends CountersAi {
                 optimalCMC = cmc;
             }
         }
-        return numCtrs < optimalCMC;
+        if (numCtrs < optimalCMC) {
+            // If the AI has less counters than the optimal CMC, it should play the ability.
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            // If the AI has enough counters or more than the optimal CMC, it should not play the ability.
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        }
     }
 
-    private boolean doChargeToOppCtrlCMCLogic(Player ai, SpellAbility sa) {
+    private AiAbilityDecision doChargeToOppCtrlCMCLogic(Player ai, SpellAbility sa) {
         Card source = sa.getHostCard();
         CardCollectionView oppInPlay = CardLists.filter(ai.getOpponents().getCardsIn(ZoneType.Battlefield), CardPredicates.NONLAND_PERMANENTS);
         int numCtrs = source.getCounters(CounterEnumType.CHARGE);
@@ -1247,6 +1270,12 @@ public class CountersPutAi extends CountersAi {
                 optimalCMC = cmc;
             }
         }
-        return numCtrs < optimalCMC;
+        if (numCtrs < optimalCMC) {
+            // If the AI has less counters than the optimal CMC, it should play the ability.
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            // If the AI has enough counters or more than the optimal CMC, it should not play the ability.
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        }
     }
 }

forge-ai/src/main/java/forge/ai/ability/CountersPutOrRemoveAi.java

@@ -50,9 +50,13 @@ public class CountersPutOrRemoveAi extends SpellAbilityAi {
      * forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         if (sa.usesTargeting()) {
-            return doTgt(ai, sa, false);
+            if (doTgt(ai, sa, false)) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            }
         }
         return super.checkApiLogic(ai, sa);
     }

forge-ai/src/main/java/forge/ai/ability/CountersRemoveAi.java

@@ -75,7 +75,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
      * forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final String type = sa.getParam("CounterType");
 
         if (sa.usesTargeting()) {
@@ -85,14 +85,14 @@ public class CountersRemoveAi extends SpellAbilityAi {
         if (!type.matches("Any") && !type.matches("All")) {
             final int currCounters = sa.getHostCard().getCounters(CounterType.getType(type));
             if (currCounters < 1) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
         return super.checkApiLogic(ai, sa);
     }
 
-    private boolean doTgt(Player ai, SpellAbility sa, boolean mandatory) {
+    private AiAbilityDecision doTgt(Player ai, SpellAbility sa, boolean mandatory) {
         final Card source = sa.getHostCard();
         final Game game = ai.getGame();
 
@@ -105,7 +105,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
         CardCollection list = CardLists.getTargetableCards(game.getCardsIn(tgt.getZone()), sa);
 
         if (list.isEmpty()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         // Filter AI-specific targets if provided
@@ -123,7 +123,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                         CardPredicates.hasCounter(CounterEnumType.ICE, 3));
                 if (!depthsList.isEmpty()) {
                     sa.getTargets().add(depthsList.getFirst());
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
 
@@ -136,7 +136,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
 
             if (!planeswalkerList.isEmpty()) {
                 sa.getTargets().add(ComputerUtilCard.getBestPlaneswalkerAI(planeswalkerList));
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         } else if (type.matches("Any")) {
             // variable amount for Hex Parasite
@@ -146,7 +146,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                 final int manaLeft = ComputerUtilCost.getMaxXValue(sa, ai, sa.isTrigger());
 
                 if (manaLeft == 0) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantAffordX);
                 }
                 amount = manaLeft;
                 xPay = true;
@@ -168,7 +168,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                         if (xPay) {
                             sa.setXManaCostPaid(ice);
                         }
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
                 }
             }
@@ -187,7 +187,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                 if (xPay) {
                     sa.setXManaCostPaid(best.getCurrentLoyalty());
                 }
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
 
             // some rules only for amount = 1
@@ -204,7 +204,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
 
                 if (!aiM1M1List.isEmpty()) {
                     sa.getTargets().add(ComputerUtilCard.getBestCreatureAI(aiM1M1List));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
 
                 // do as P1P1 part
@@ -213,7 +213,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
 
                 if (!aiUndyingList.isEmpty()) {
                     sa.getTargets().add(ComputerUtilCard.getBestCreatureAI(aiUndyingList));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
   
                 // TODO stun counters with canRemoveCounters check
@@ -224,7 +224,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                         CardPredicates.hasCounter(CounterEnumType.P1P1));
                 if (!oppP1P1List.isEmpty()) {
                     sa.getTargets().add(ComputerUtilCard.getBestCreatureAI(oppP1P1List));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
 
                 // fallback to remove any counter from opponent
@@ -236,7 +236,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                     for (final CounterType aType : best.getCounters().keySet()) {
                         if (!ComputerUtil.isNegativeCounter(aType, best)) {
                             sa.getTargets().add(best);
-                            return true;
+                            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                         }
                     }
                 }
@@ -257,7 +257,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
 
             if (!aiList.isEmpty()) {
                 sa.getTargets().add(ComputerUtilCard.getBestCreatureAI(aiList));
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         } else if (type.equals("P1P1")) {
             // no special amount for that one yet
@@ -275,7 +275,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                 }
                 if (!aiList.isEmpty()) {
                     sa.getTargets().add(ComputerUtilCard.getBestCreatureAI(aiList));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
 
@@ -289,7 +289,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
 
                 if (!oppList.isEmpty()) {
                     sa.getTargets().add(ComputerUtilCard.getWorstCreatureAI(oppList));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
         } else if (type.equals("TIME")) {
@@ -300,7 +300,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                 final int manaLeft = ComputerUtilCost.getMaxXValue(sa, ai, sa.isTrigger());
 
                 if (manaLeft == 0) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantAffordX);
                 }
                 amount = manaLeft;
                 xPay = true;
@@ -318,7 +318,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                 if (xPay) {
                     sa.setXManaCostPaid(timeCount);
                 }
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         }
         if (mandatory) {
@@ -327,7 +327,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
                 CardCollection adaptCreats = CardLists.filter(list, CardPredicates.hasKeyword(Keyword.ADAPT));
                 if (!adaptCreats.isEmpty()) {
                     sa.getTargets().add(ComputerUtilCard.getWorstAI(adaptCreats));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
 
                 // Outlast nice target
@@ -338,29 +338,27 @@ public class CountersRemoveAi extends SpellAbilityAi {
 
                     if (!betterTargets.isEmpty()) {
                         sa.getTargets().add(ComputerUtilCard.getWorstAI(betterTargets));
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
 
                     sa.getTargets().add(ComputerUtilCard.getWorstAI(outlastCreats));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
 
             sa.getTargets().add(ComputerUtilCard.getWorstAI(list));
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
     }
 
     @Override
     protected AiAbilityDecision doTriggerAINoCost(Player aiPlayer, SpellAbility sa, boolean mandatory) {
         if (sa.usesTargeting()) {
-            boolean canTarget = doTgt(aiPlayer, sa, mandatory);
-            return canTarget ? new AiAbilityDecision(100, AiPlayDecision.WillPlay)
-                             : new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            return doTgt(aiPlayer, sa, mandatory);
         }
         return mandatory ? new AiAbilityDecision(100, AiPlayDecision.WillPlay)
-                         : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+                         : new AiAbilityDecision(0, AiPlayDecision.MandatoryPlay);
     }
 
     /*
@@ -374,8 +372,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
         GameEntity target = (GameEntity) params.get("Target");
         CounterType type = (CounterType) params.get("CounterType");
 
-        if (target instanceof Card) {
-            Card targetCard = (Card) target;
+        if (target instanceof Card targetCard) {
             if (targetCard.getController().isOpponentOf(player)) {
                 return !ComputerUtil.isNegativeCounter(type, targetCard) ? max : min;
             } else {
@@ -386,8 +383,7 @@ public class CountersRemoveAi extends SpellAbilityAi {
 
                 return ComputerUtil.isNegativeCounter(type, targetCard) ? max : min;
             }
-        } else if (target instanceof Player) {
-            Player targetPlayer = (Player) target;
+        } else if (target instanceof Player targetPlayer) {
             if (targetPlayer.isOpponentOf(player)) {
                 return !type.is(CounterEnumType.POISON) ? max : min;
             } else {

forge-ai/src/main/java/forge/ai/ability/DestroyAi.java

@@ -21,11 +21,7 @@ import forge.util.collect.FCollectionView;
 public class DestroyAi extends SpellAbilityAi {
     @Override
     public AiAbilityDecision chkAIDrawback(SpellAbility sa, Player ai) {
-        if (checkApiLogic(ai, sa)) {
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
-        } else {
-            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
-        }
+        return checkApiLogic(ai, sa);
     }
 
     @Override
@@ -107,7 +103,7 @@ public class DestroyAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         final Card source = sa.getHostCard();
         final boolean noRegen = sa.hasParam("NoRegen");
         final String logic = sa.getParam("AILogic");
@@ -115,7 +111,7 @@ public class DestroyAi extends SpellAbilityAi {
         CardCollection list;
 
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         // Targeting
@@ -129,7 +125,7 @@ public class DestroyAi extends SpellAbilityAi {
 
             // Assume there where already enough targets chosen by AI Logic Above
             if (sa.hasParam("AILogic") && !sa.canAddMoreTarget() && sa.isTargetNumberValid()) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
 
             // reset targets before AI Logic part
@@ -149,13 +145,17 @@ public class DestroyAi extends SpellAbilityAi {
 
             if (maxTargets == 0) {
                 // can't afford X or otherwise target anything
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantAffordX);
             }
 
             if (sa.hasParam("TargetingPlayer")) {
                 Player targetingPlayer = AbilityUtils.getDefinedPlayers(source, sa.getParam("TargetingPlayer"), sa).get(0);
                 sa.setTargetingPlayer(targetingPlayer);
-                return targetingPlayer.getController().chooseTargetsFor(sa);
+                if (targetingPlayer.getController().chooseTargetsFor(sa)) {
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                } else {
+                    return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+                }
             }
 
             // AI doesn't destroy own cards if it isn't defined in AI logic
@@ -210,7 +210,7 @@ public class DestroyAi extends SpellAbilityAi {
             // Try to avoid targeting creatures that are dead on board
             list = ComputerUtil.filterCreaturesThatWillDieThisTurn(ai, list, sa);
             if (list.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
 
             // target loop
@@ -225,7 +225,7 @@ public class DestroyAi extends SpellAbilityAi {
                 if (list.isEmpty()) {
                     if (!sa.isMinTargetChosen() || sa.isZeroTargets()) {
                         sa.resetTargets();
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                     } else {
                         // TODO is this good enough? for up to amounts?
                         break;
@@ -239,7 +239,7 @@ public class DestroyAi extends SpellAbilityAi {
                     if ("OppDestroyYours".equals(logic)) {
                         Card aiBest = ComputerUtilCard.getBestCreatureAI(ai.getCreaturesInPlay());
                         if (ComputerUtilCard.evaluateCreature(aiBest) > ComputerUtilCard.evaluateCreature(choice) - 40) {
-                            return false;
+                            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                         }
                     }
                 } else if (CardLists.getNotType(list, "Land").isEmpty()) {
@@ -248,7 +248,7 @@ public class DestroyAi extends SpellAbilityAi {
                     if ("LandForLand".equals(logic) || "GhostQuarter".equals(logic)) {
                         // Strip Mine, Wasteland - cut short if the relevant logic fails
                         if (!doLandForLandRemovalLogic(sa, ai, choice, logic)) {
-                            return false;
+                            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                         }
                     }
                 } else {
@@ -258,14 +258,14 @@ public class DestroyAi extends SpellAbilityAi {
                 //option to hold removal instead only applies for single targeted removal
                 if (!sa.isTrigger() && sa.getMaxTargets() == 1) {
                     if (choice == null || !ComputerUtilCard.useRemovalNow(sa, choice, 0, ZoneType.Graveyard)) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                     }
                 }
 
                 if (choice == null) { // can't find anything left
                     if (!sa.isMinTargetChosen() || sa.isZeroTargets()) {
                         sa.resetTargets();
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                     } else {
                         // TODO is this good enough? for up to amounts?
                         break;
@@ -302,18 +302,18 @@ public class DestroyAi extends SpellAbilityAi {
                 || !source.getGame().getPhaseHandler().isPlayerTurn(ai)
                 || ai.getLife() <= 5)) {
                 // Basic ai logic for Lethal Vapors
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             } else if ("Always".equals(logic)) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
 
             if (list.isEmpty()
                     || !CardLists.filterControlledBy(list, ai).isEmpty()
                     || CardLists.getNotKeyword(list, Keyword.INDESTRUCTIBLE).isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/DiscoverAi.java

@@ -13,12 +13,12 @@ import java.util.Map;
 public class DiscoverAi extends SpellAbilityAi {
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false; // prevent infinite loop
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
-        return true;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     /**
@@ -38,11 +38,7 @@ public class DiscoverAi extends SpellAbilityAi {
             return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
-        if (checkApiLogic(ai, sa)) {
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
-        } else {
-            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
-        }
+        return checkApiLogic(ai, sa);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/DrawAi.java

@@ -42,43 +42,46 @@ public class DrawAi extends SpellAbilityAi {
      * @see forge.ai.SpellAbilityAi#checkApiLogic(forge.game.player.Player, forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         if (!targetAI(ai, sa, false)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         if (sa.usesTargeting()) {
             final Player player = sa.getTargets().getFirstTargetedPlayer();
             if (player != null && player.isOpponentOf(ai)) {
-                return true;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
 
         // prevent run-away activations - first time will always return true
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if (ComputerUtil.playImmediately(ai, sa)) {
-            return true;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         // Don't tap creatures that may be able to block
         if (ComputerUtil.waitForBlocking(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
         }
 
         if (!canLoot(ai, sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         if (ComputerUtilCost.isSacrificeSelfCost(sa.getPayCosts())) {
             // Canopy lands and other cards that sacrifice themselves to draw cards
-            return ai.getCardsIn(ZoneType.Hand).isEmpty()
-                    || (sa.getHostCard().isLand() && ai.getLandsInPlay().size() >= 5); // TODO: make this configurable in the AI profile
+            if (ai.getCardsIn(ZoneType.Hand).isEmpty()
+                    || (sa.getHostCard().isLand() && ai.getLandsInPlay().size() >= 5)) {
+                // TODO: make this configurable in the AI profile
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            }
         }
 
-        return true;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     /*

forge-ai/src/main/java/forge/ai/ability/EffectAi.java

@@ -275,7 +275,7 @@ public class EffectAi extends SpellAbilityAi {
                 }
                 return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             } else if (logic.equals("Fight")) {
-                return FightAi.canFightAi(ai, sa, 0, 0) ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+                return FightAi.canFightAi(ai, sa, 0,0);
             } else if (logic.equals("Pump")) {
                 sa.resetTargets();
                 List<Card> options = CardUtil.getValidCardsToTarget(sa);

forge-ai/src/main/java/forge/ai/ability/FightAi.java

@@ -24,13 +24,13 @@ public class FightAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         sa.resetTargets();
         final Card source = sa.getHostCard();
 
         // everything is defined or targeted above, can't do anything there unless a specific logic is set
         if (sa.hasParam("Defined") && !sa.usesTargeting()) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         // Get creature lists
@@ -42,8 +42,10 @@ public class FightAi extends SpellAbilityAi {
         // Filter MustTarget requirements
         StaticAbilityMustTarget.filterMustTargetCards(ai, humCreatures, sa);
 
-        if (humCreatures.isEmpty())
-            return false; //prevent IndexOutOfBoundsException on MOJHOSTO variant
+        //prevent IndexOutOfBoundsException on MOJHOSTO variant
+        if (humCreatures.isEmpty()) {
+            return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
+        }
 
         // assumes the triggered card belongs to the ai
         if (sa.hasParam("Defined")) {
@@ -54,7 +56,7 @@ public class FightAi extends SpellAbilityAi {
                 }
             }
             if (fighter1List.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
             }
             Card fighter1 = fighter1List.get(0);
             for (Card humanCreature : humCreatures) {
@@ -62,10 +64,11 @@ public class FightAi extends SpellAbilityAi {
                         && !canKill(humanCreature, fighter1, 0)) {
                     // todo: check min/max targets; see if we picked the best matchup
                     sa.getTargets().add(humanCreature);
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
-            return false; // bail at this point, otherwise the AI will overtarget and waste the activation
+            // bail at this point, otherwise the AI will overtarget and waste the activation
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         if (sa.hasParam("TargetsFromDifferentZone")) {
@@ -77,12 +80,12 @@ public class FightAi extends SpellAbilityAi {
                             // todo: check min/max targets; see if we picked the best matchup
                             sa.getTargets().add(humanCreature);
                             sa.getTargets().add(aiCreature);
-                            return true;
+                            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                         }
                     }
                 }
             }
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
         for (Card creature1 : humCreatures) {
             for (Card creature2 : humCreatures) {
@@ -97,11 +100,11 @@ public class FightAi extends SpellAbilityAi {
                     // todo: check min/max targets; see if we picked the best matchup
                     sa.getTargets().add(creature1);
                     sa.getTargets().add(creature2);
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
         }
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
     }
 
     @Override
@@ -110,11 +113,7 @@ public class FightAi extends SpellAbilityAi {
             return new AiAbilityDecision(100, AiPlayDecision.WillPlay); // e.g. Hunt the Weak, the AI logic was already checked through canFightAi
         }
 
-        if (checkApiLogic(aiPlayer, sa)) {
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
-        } else {
-            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
-        }
+        return checkApiLogic(aiPlayer, sa);
     }
 
     @Override
@@ -132,12 +131,14 @@ public class FightAi extends SpellAbilityAi {
             }
         }
 
-        if (checkApiLogic(ai, sa)) {
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        AiAbilityDecision decision = checkApiLogic(ai, sa);
+        if (decision.willingToPlay()) {
+            return decision;
         }
         if (!mandatory) {
-            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            return decision;
         }
+        // if mandatory, we have to play it, so we will try to make a good trade or no trade
 
         //try to make a good trade or no trade
         final Card source = sa.getHostCard();
@@ -153,19 +154,19 @@ public class FightAi extends SpellAbilityAi {
                 if (canKill(aiCreature, humanCreature, 0)
                         && ComputerUtilCard.evaluateCreature(humanCreature) > ComputerUtilCard.evaluateCreature(aiCreature)) {
                     sa.getTargets().add(humanCreature);
-                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                    return new AiAbilityDecision(100, AiPlayDecision.MandatoryPlay);
                 }
             }
             for (Card humanCreature : humCreatures) {
                 if (!canKill(humanCreature, aiCreature, 0)) {
                     sa.getTargets().add(humanCreature);
-                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                    return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
                 }
             }
             sa.getTargets().add(humCreatures.get(0));
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
         }
-        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
     }
     
     /**
@@ -176,7 +177,7 @@ public class FightAi extends SpellAbilityAi {
      * @param power	bonus to power
      * @return true if fight effect should be played, false otherwise
      */
-    public static boolean canFightAi(final Player ai, final SpellAbility sa, int power, int toughness) {
+    public static AiAbilityDecision canFightAi(final Player ai, final SpellAbility sa, int power, int toughness) {
     	final Card source = sa.getHostCard();
         final String sourceName = ComputerUtilAbility.getAbilitySourceName(sa);
         AbilitySub tgtFight = sa.getSubAbility();
@@ -208,7 +209,7 @@ public class FightAi extends SpellAbilityAi {
         ComputerUtilCard.sortByEvaluateCreature(aiCreatures);
         ComputerUtilCard.sortByEvaluateCreature(humCreatures);
         if (humCreatures.isEmpty() || aiCreatures.isEmpty()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
         }
         // Evaluate creature pairs
         for (Card humanCreature : humCreatures) {
@@ -238,7 +239,7 @@ public class FightAi extends SpellAbilityAi {
                                 tgtFight.resetTargets();
                                 tgtFight.getTargets().add(humanCreature);
                             }
-                            return true;
+                            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                         }
                     } else {
                         // Other cards that use AILogic PowerDmg and a single target
@@ -248,7 +249,7 @@ public class FightAi extends SpellAbilityAi {
                                 tgtFight.resetTargets();
                                 tgtFight.getTargets().add(humanCreature);
                             }
-                            return true;
+                            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                         }
                     }
                 } else {
@@ -261,12 +262,12 @@ public class FightAi extends SpellAbilityAi {
                         sa.getTargets().add(aiCreature);
                         tgtFight.resetTargets();
                         tgtFight.getTargets().add(humanCreature);
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
                 }
             }
         }
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
     }
 
     /**

forge-ai/src/main/java/forge/ai/ability/GoadAi.java

@@ -14,7 +14,7 @@ import java.util.List;
 public class GoadAi extends SpellAbilityAi {
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         final Card source = sa.getHostCard();
         final Game game = source.getGame();
 
@@ -24,7 +24,7 @@ public class GoadAi extends SpellAbilityAi {
             List<Card> list = CardLists.getTargetableCards(game.getCardsIn(ZoneType.Battlefield), sa);
 
             if (list.isEmpty())
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
 
             if (game.getPlayers().size() > 2) {
                 // use this part only in multiplayer
@@ -50,7 +50,7 @@ public class GoadAi extends SpellAbilityAi {
                 if (!betterList.isEmpty()) {
                     list = betterList;
                     sa.getTargets().add(ComputerUtilCard.getBestCreatureAI(list));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             } else {
                 // single Player, goaded creature would attack ai
@@ -71,37 +71,40 @@ public class GoadAi extends SpellAbilityAi {
                 if (!betterList.isEmpty()) {
                     list = betterList;
                     sa.getTargets().add(ComputerUtilCard.getBestCreatureAI(list));
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
 
             // AI does not find a good creature to goad.
             // because if it would goad a creature it would attack AI.
             // AI might not have enough information to block it
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
-        return true;
+
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     @Override
     protected AiAbilityDecision doTriggerAINoCost(Player ai, SpellAbility sa, boolean mandatory) {
-        if (checkApiLogic(ai, sa)) {
-            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        AiAbilityDecision decision = checkApiLogic(ai, sa);
+        if (decision.willingToPlay()) {
+            return decision;
         }
         if (!mandatory) {
             return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
+        // mandatory play, so we have to play it
         if (sa.usesTargeting()) {
             if (sa.getTargetRestrictions().canTgtPlayer()) {
                 for (Player opp : ai.getOpponents()) {
                     if (sa.canTarget(opp)) {
                         sa.getTargets().add(opp);
-                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                        return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
                     }
                 }
                 if (sa.canTarget(ai)) {
                     sa.getTargets().add(ai);
-                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                    return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
                 }
             } else {
                 List<Card> list = CardLists.getTargetableCards(ai.getGame().getCardsIn(ZoneType.Battlefield), sa);
@@ -110,7 +113,7 @@ public class GoadAi extends SpellAbilityAi {
                     return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
 
                 sa.getTargets().add(ComputerUtilCard.getWorstCreatureAI(list));
-                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                return new AiAbilityDecision(30, AiPlayDecision.MandatoryPlay);
             }
         }
         return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);

forge-ai/src/main/java/forge/ai/ability/LifeGainAi.java

@@ -126,7 +126,7 @@ public class LifeGainAi extends SpellAbilityAi {
      * forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final Card source = sa.getHostCard();
         final String sourceName = ComputerUtilAbility.getAbilitySourceName(sa);
         final String aiLogic = sa.getParamOrDefault("AILogic", "");
@@ -148,12 +148,12 @@ public class LifeGainAi extends SpellAbilityAi {
         // Ugin AI: always use ultimate
         if (sourceName.equals("Ugin, the Spirit Dragon")) {
             // TODO: somehow link with DamageDealAi for cases where +1 = win
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         // don't use it if no life to gain
         if (!activateForCost && lifeAmount <= 0) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
         // don't play if the conditions aren't met, unless it would trigger a
         // beneficial sub-condition
@@ -161,47 +161,52 @@ public class LifeGainAi extends SpellAbilityAi {
             final AbilitySub abSub = sa.getSubAbility();
             if (abSub != null && !sa.isWrapper() && "True".equals(source.getSVar("AIPlayForSub"))) {
                 if (!abSub.getConditions().areMet(abSub)) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.ConditionsNotMet);
                 }
             } else {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.ConditionsNotMet);
             }
         }
 
         if (!activateForCost && !ai.canGainLife()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         // prevent run-away activations - first time will always return true
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if (sa.usesTargeting()) {
             if (!target(ai, sa, true)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
         }
 
         if (ComputerUtil.playImmediately(ai, sa)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         if (isSorcerySpeed(sa, ai)
                 || sa.getSubAbility() != null || playReusable(ai, sa)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         if (sa.getPayCosts() != null && sa.getPayCosts().hasSpecificCostType(CostSacrifice.class)) {
-            return true; // sac costs should be performed at Instant speed when able
+            // sac costs should be performed at Instant speed when able
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         // Save instant-speed life-gain unless it is really worth it
         final float value = 0.9f * lifeAmount / life;
         if (value < 0.2f) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        }
+        if (MyRandom.getRandom().nextFloat() < value) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
-        return MyRandom.getRandom().nextFloat() < value;
     }
 
     /**

forge-ai/src/main/java/forge/ai/ability/LifeLoseAi.java

@@ -94,7 +94,7 @@ public class LifeLoseAi extends SpellAbilityAi {
      * forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final Card source = sa.getHostCard();
         final String amountStr = sa.getParam("LifeAmount");
         final String aiLogic = sa.getParamOrDefault("AILogic", "");
@@ -102,7 +102,7 @@ public class LifeLoseAi extends SpellAbilityAi {
 
         if (sa.usesTargeting()) {
             if (!doTgt(ai, sa, false)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
         }
 
@@ -115,15 +115,15 @@ public class LifeLoseAi extends SpellAbilityAi {
         }
 
         if (amount <= 0) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if (ComputerUtil.playImmediately(ai, sa)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         final PlayerCollection tgtPlayers = getPlayers(ai, sa);
@@ -132,7 +132,7 @@ public class LifeLoseAi extends SpellAbilityAi {
                 .filter(PlayerPredicates.isOpponentOf(ai).and(PlayerPredicates.lifeLessOrEqualTo(amount)));
         // killing opponents asap
         if (!filteredPlayer.isEmpty()) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         // Sacrificing a creature in response to something dangerous is generally good in any phase
@@ -144,20 +144,20 @@ public class LifeLoseAi extends SpellAbilityAi {
         // Don't use loselife before main 2 if possible
         if (ai.getGame().getPhaseHandler().getPhase().isBefore(PhaseType.MAIN2) && !sa.hasParam("ActivationPhases")
                 && !ComputerUtil.castSpellInMain1(ai, sa) && !aiLogic.contains("AnyPhase") && !isSacCost) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WaitForMain2);
         }
 
         // Don't tap creatures that may be able to block
         if (ComputerUtil.waitForBlocking(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
         }
 
         if (isSorcerySpeed(sa, ai) || sa.hasParam("ActivationPhases") || playReusable(ai, sa)
                 || ComputerUtil.activateForCost(sa, ai)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     /*

forge-ai/src/main/java/forge/ai/ability/ManaAi.java

@@ -87,18 +87,22 @@ public class ManaAi extends SpellAbilityAi {
      * forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         if (sa.hasParam("AILogic")) {
-            return true; // handled elsewhere, does not meet the standard requirements
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay); // handled elsewhere, does not meet the standard requirements
         }
 
         // TODO check if it would be worth it to keep mana open for opponents turn anyway
         if (ComputerUtil.activateForCost(sa, ai)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
-        return sa.getPayCosts().hasNoManaCost() && sa.getPayCosts().isReusuableResource()
-                && sa.getSubAbility() == null && (improvesPosition(ai, sa) || ComputerUtil.playImmediately(ai, sa));
+        if (sa.getPayCosts().hasNoManaCost() && sa.getPayCosts().isReusuableResource()
+                && sa.getSubAbility() == null && (improvesPosition(ai, sa) || ComputerUtil.playImmediately(ai, sa))) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     /**
@@ -276,7 +280,6 @@ public class ManaAi extends SpellAbilityAi {
     @Override
     protected AiAbilityDecision canPlayAI(Player ai, SpellAbility sa) {
         final String logic = sa.getParamOrDefault("AILogic", "");
-        boolean result = checkApiLogic(ai, sa);
-        return result ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        return checkApiLogic(ai, sa);
     }
 }

forge-ai/src/main/java/forge/ai/ability/ManifestBaseAi.java

@@ -81,11 +81,11 @@ public abstract class ManifestBaseAi extends SpellAbilityAi {
     abstract protected boolean shouldApply(final Card card, final Player ai, final SpellAbility sa);
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         final Game game = ai.getGame();
         final Card host = sa.getHostCard();
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if (sa.hasParam("Choices") || sa.hasParam("ChoiceZone")) {
@@ -98,36 +98,42 @@ public abstract class ManifestBaseAi extends SpellAbilityAi {
                 choices = CardLists.getValidCards(choices, sa.getParam("Choices"), ai, host, sa);
             }
             if (choices.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlaySa);
             }
         } else if ("TopOfLibrary".equals(sa.getParamOrDefault("Defined", "TopOfLibrary"))) {
             // Library is empty, no Manifest
             final CardCollectionView library = ai.getCardsIn(ZoneType.Library);
             if (library.isEmpty())
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
 
             // try not to mill himself with Manifest
             if (library.size() < 5 && !ai.isCardInPlay("Laboratory Maniac")) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             if (!shouldApply(library.getFirst(), ai, sa)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
         }
-        // Probably should be a little more discerning on playing during OPPs turn
+        // TODO Probably should be a little more discerning on playing during OPPs turn
         if (playReusable(ai, sa)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
         if (game.getPhaseHandler().is(PhaseType.COMBAT_DECLARE_ATTACKERS)) {
             // Add blockers?
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.AddBoardPresence);
         }
         if (sa.isAbility()) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
-        return MyRandom.getRandom().nextFloat() < .8;
+        if ( MyRandom.getRandom().nextFloat() < .8) {
+            // 80% chance to play a Manifest spell
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            // 20% chance to not play a Manifest spell
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        }
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/MeldAi.java

@@ -11,19 +11,24 @@ import forge.game.zone.ZoneType;
 
 public class MeldAi extends SpellAbilityAi {
     @Override
-    protected boolean checkApiLogic(Player aiPlayer, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player aiPlayer, SpellAbility sa) {
         String primaryMeld = sa.getParam("Primary");
         String secondaryMeld = sa.getParam("Secondary");
         
         CardCollectionView cardsOTB = aiPlayer.getCardsIn(ZoneType.Battlefield);
         if (cardsOTB.isEmpty()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
         }
 
         boolean hasPrimaryMeld = cardsOTB.anyMatch(CardPredicates.nameEquals(primaryMeld).and(CardPredicates.isOwner(aiPlayer)));
         boolean hasSecondaryMeld = cardsOTB.anyMatch(CardPredicates.nameEquals(secondaryMeld).and(CardPredicates.isOwner(aiPlayer)));
-        
-        return hasPrimaryMeld && hasSecondaryMeld && sa.getHostCard().getName().equals(primaryMeld);
+        if (hasPrimaryMeld && hasSecondaryMeld && sa.getHostCard().getName().equals(primaryMeld)) {
+            // If the primary meld card is on the battlefield and both meld cards are owned by the AI, play the ability
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            // If the secondary meld card is on the battlefield and it is the one being activated, play the ability
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        }
     }
     
     @Override

forge-ai/src/main/java/forge/ai/ability/MillAi.java

@@ -60,7 +60,7 @@ public class MillAi extends SpellAbilityAi {
     }
     
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         /*
          * TODO:
          * - logic in targetAI looks dodgy
@@ -70,16 +70,17 @@ public class MillAi extends SpellAbilityAi {
          * effect due to possibility of "lose abilities" effect)
          */
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;   // prevents mill 0 infinite loop?
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
         
         if (("You".equals(sa.getParam("Defined")) || "Player".equals(sa.getParam("Defined")))
                 && ai.getCardsIn(ZoneType.Library).size() < 10) {
-            return false;   // prevent self and each player mill when library is small
+            // prevent self and each player mill when library is small
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
         
         if (sa.usesTargeting() && !targetAI(ai, sa, false)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         if (sa.hasParam("NumCards") && (sa.getParam("NumCards").equals("X") || sa.getParam("NumCards").equals("Z"))
@@ -87,9 +88,11 @@ public class MillAi extends SpellAbilityAi {
             // Set PayX here to maximum value.
             final int cardsToDiscard = getNumToDiscard(ai, sa);
             sa.setXManaCostPaid(cardsToDiscard);
-            return cardsToDiscard > 0;
+            if (cardsToDiscard <= 0) {
+                return new AiAbilityDecision(0, AiPlayDecision.CantAffordX);
             }
-        return true;
+        }
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     private boolean targetAI(final Player ai, final SpellAbility sa, final boolean mandatory) {

forge-ai/src/main/java/forge/ai/ability/PermanentAi.java

@@ -43,27 +43,27 @@ public class PermanentAi extends SpellAbilityAi {
      * here
      */
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         final Card source = sa.getHostCard();
 
         // check on legendary
         if (!source.ignoreLegendRule() && ai.isCardInPlay(source.getName())) {
             // TODO check the risk we'd lose the effect with bad timing
+            // TODO Technically we're not checking if same card in play is also legendary, but this is a good enough approximation
             if (!source.hasSVar("AILegendaryException")) {
-                // AiPlayDecision.WouldDestroyLegend
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.WouldDestroyLegend);
             } else {
                 String specialRule = source.getSVar("AILegendaryException");
                 if ("TwoCopiesAllowed".equals(specialRule)) {
                     // One extra copy allowed on the battlefield, e.g. Brothers Yamazaki
                     if (CardLists.count(ai.getCardsIn(ZoneType.Battlefield), CardPredicates.nameEquals(source.getName())) > 1) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.WouldDestroyLegend);
                     }
                 } else if ("AlwaysAllowed".equals(specialRule)) {
                     // Nothing to do here, check for Legendary is disabled
                 } else {
                     // Unknown hint, assume two copies not allowed
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.WouldDestroyLegend);
                 }
             }
         }
@@ -71,8 +71,7 @@ public class PermanentAi extends SpellAbilityAi {
         if (source.getType().hasSupertype(Supertype.World)) {
             CardCollection list = CardLists.getType(ai.getCardsIn(ZoneType.Battlefield), "World");
             if (!list.isEmpty()) {
-                // AiPlayDecision.WouldDestroyWorldEnchantment
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.WouldDestroyWorldEnchantment);
             }
         }
 
@@ -93,9 +92,8 @@ public class PermanentAi extends SpellAbilityAi {
                     }
                 }
             } else {
-                // AiPlayDecision.CantAffordX
                 if (xPay <= 0) {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantAffordX);
                 }
                 sa.setXManaCostPaid(xPay);
             }
@@ -103,8 +101,7 @@ public class PermanentAi extends SpellAbilityAi {
             // if mana is zero, but card mana cost does have X, then something is wrong
             ManaCost cardCost = source.getManaCost();
             if (cardCost != null && cardCost.countX() > 0) {
-                // AiPlayDecision.CantPlayAi
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CostNotAcceptable);
             }
         }
 
@@ -147,10 +144,10 @@ public class PermanentAi extends SpellAbilityAi {
                 }
                 if (oppCards.size() > 3 && oppCards.size() >= aiCards.size() * 2) {
                     sa.setXManaCostPaid(manaValue);
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         for (KeywordInterface ki : source.getKeywords(Keyword.MULTIKICKER)) {
@@ -177,7 +174,7 @@ public class PermanentAi extends SpellAbilityAi {
                 sa.clearOptionalKeywordAmount();
                 // Bail if the card cost was {0} and no multikicker was paid (e.g. Everflowing Chalice).
                 // TODO: update this if there's ever a card where it makes sense to play it for {0} with no multikicker
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CostNotAcceptable);
             }
         }
 
@@ -213,8 +210,7 @@ public class PermanentAi extends SpellAbilityAi {
             emptyAbility.setActivatingPlayer(ai);
 
             if (!ComputerUtilCost.canPayCost(emptyAbility, ai, true)) {
-                // AiPlayDecision.AnotherTime
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantAfford);
             }
         }
 
@@ -310,10 +306,12 @@ public class PermanentAi extends SpellAbilityAi {
                 }
             }
 
-            return !dontCast;
+            if (dontCast) {
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            }
         }
 
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     @Override
@@ -333,8 +331,13 @@ public class PermanentAi extends SpellAbilityAi {
         if (!checkPhaseRestrictions(ai, sa, ai.getGame().getPhaseHandler())) {
             return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
-        boolean result = checkApiLogic(ai, sa);
-        return (result || mandatory) ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        AiAbilityDecision decision = checkApiLogic(ai, sa);
+        if (decision.willingToPlay()) {
+            return decision;
+        } else if (mandatory) {
+            return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
+        } else {
+            return decision;
+        }
      }
-
 }

forge-ai/src/main/java/forge/ai/ability/PermanentCreatureAi.java

@@ -195,9 +195,10 @@ public class PermanentCreatureAi extends PermanentAi {
     }
 
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
-        if (!super.checkApiLogic(ai, sa)) {
-            return false;
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
+        AiAbilityDecision decision = super.checkApiLogic(ai, sa);
+        if (!decision.willingToPlay()) {
+            return decision;
         }
 
         final Card card = sa.getHostCard();
@@ -220,16 +221,15 @@ public class PermanentCreatureAi extends PermanentAi {
         // AiPlayDecision.WouldBecomeZeroToughnessCreature
         if (card.hasStartOfKeyword("etbCounter") || mana.countX() != 0
                 || card.hasETBTrigger(false) || card.hasETBReplacement() || card.hasSVar("NoZeroToughnessAI")) {
-                return true;
+                return decision;
         }
 
         final Card copy = CardCopyService.getLKICopy(card);
         ComputerUtilCard.applyStaticContPT(game, copy, null);
         if (copy.getNetToughness() > 0) {
-            return true;
+            return decision;
         }
 
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.WouldBecomeZeroToughnessCreature);
     }
-
 }

forge-ai/src/main/java/forge/ai/ability/PermanentNoncreatureAi.java

@@ -1,5 +1,7 @@
 package forge.ai.ability;
 
+import forge.ai.AiAbilityDecision;
+import forge.ai.AiPlayDecision;
 import forge.ai.ComputerUtilAbility;
 import forge.game.Game;
 import forge.game.ability.AbilityFactory;
@@ -21,9 +23,11 @@ public class PermanentNoncreatureAi extends PermanentAi {
      * here
      */
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
-        if (!super.checkApiLogic(ai, sa))
-            return false;
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
+        AiAbilityDecision decision = super.checkApiLogic(ai, sa);
+        if (!decision.willingToPlay()) {
+            return decision;
+        }
 
         final Card host = sa.getHostCard();
         final String sourceName = ComputerUtilAbility.getAbilitySourceName(sa);
@@ -41,9 +45,10 @@ public class PermanentNoncreatureAi extends PermanentAi {
                 // TODO: consider replacing the condition with host.hasSVar("OblivionRing")
                 targets = CardLists.filterControlledBy(targets, ai.getOpponents());
             }
-            // AiPlayDecision.AnotherTime
-            return !targets.isEmpty();
-        }
-        return true;
+            if (targets.isEmpty()) {
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            }
+        }
+        return decision;
     }
 }

forge-ai/src/main/java/forge/ai/ability/PlayAi.java

@@ -26,7 +26,7 @@ import java.util.stream.Collectors;
 public class PlayAi extends SpellAbilityAi {
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         final String logic = sa.getParamOrDefault("AILogic", "");
 
         final Game game = ai.getGame();
@@ -34,11 +34,11 @@ public class PlayAi extends SpellAbilityAi {
         // don't use this as a response (ReplaySpell logic is an exception, might be called from a subability
         // while the trigger is on stack)
         if (!game.getStack().isEmpty() && !"ReplaySpell".equals(logic)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false; // prevent infinite loop
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if (game.getRules().hasAppliedVariant(GameType.MoJhoSto) && source.getName().equals("Jhoira of the Ghitu Avatar")) {
@@ -48,38 +48,46 @@ public class PlayAi extends SpellAbilityAi {
             int numLandsForJhoira = aic.getIntProperty(AiProps.MOJHOSTO_NUM_LANDS_TO_ACTIVATE_JHOIRA);
             int chanceToActivateInst = 100 - aic.getIntProperty(AiProps.MOJHOSTO_CHANCE_TO_USE_JHOIRA_COPY_INSTANT);
             if (ai.getLandsInPlay().size() < numLandsForJhoira) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
             // Don't spam activate the Instant copying ability all the time to give the AI a chance to use other abilities
             // Can probably be improved, but as random as MoJhoSto already is, probably not a huge deal for now
             if ("Instant".equals(sa.getParam("AnySupportedCard")) && MyRandom.percentTrue(chanceToActivateInst)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         List<Card> cards = getPlayableCards(sa, ai);
         if (cards.isEmpty()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
         }
 
         if ("ReplaySpell".equals(logic)) {
-            return ComputerUtil.targetPlayableSpellCard(ai, cards, sa, sa.hasParam("WithoutManaCost"), false);
+            if (ComputerUtil.targetPlayableSpellCard(ai, cards, sa, sa.hasParam("WithoutManaCost"), false)) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            }
         } else if (logic.startsWith("NeedsChosenCard")) {
             int minCMC = 0;
             if (sa.getPayCosts().getCostMana() != null) {
                 minCMC = sa.getPayCosts().getTotalMana().getCMC();
             }
             cards = CardLists.filter(cards, CardPredicates.greaterCMC(minCMC));
-            return chooseSingleCard(ai, sa, cards, sa.hasParam("Optional"), null, null) != null;
+            if (chooseSingleCard(ai, sa, cards, sa.hasParam("Optional"), null, null) != null) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
+            }
         } else if ("WithTotalCMC".equals(logic)) {
             // Try to play only when there are more than three playable cards.
             if (cards.size() < 3)
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             if (sa.costHasManaX()) {
                 int amount = ComputerUtilCost.getMaxXValue(sa, ai, sa.isTrigger());
                 if (amount < ComputerUtilCard.getBestAI(cards).getCMC())
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 int totalCMC = 0;
                 for (Card c : cards) {
                     totalCMC += c.getCMC();
@@ -97,10 +105,14 @@ public class PlayAi extends SpellAbilityAi {
             Card rem = source.getExiledCards().getFirst();
             CardTypeView t = rem.getState(CardStateName.Original).getType();
 
-            return t.isPermanent() && !t.isLand();
+            if (t.isPermanent() && !t.isLand()) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            }
         }
 
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     /**
@@ -126,8 +138,7 @@ public class PlayAi extends SpellAbilityAi {
                 return result ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
-            boolean result = checkApiLogic(ai, sa);
-            return result ? new AiAbilityDecision(100, AiPlayDecision.WillPlay) : new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            return checkApiLogic(ai, sa);
         }
 
         return new AiAbilityDecision(100, AiPlayDecision.WillPlay);

forge-ai/src/main/java/forge/ai/ability/PoisonAi.java

@@ -36,18 +36,22 @@ public class PoisonAi extends SpellAbilityAi {
      * forge.game.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         // Don't tap creatures that may be able to block
         if (ComputerUtil.waitForBlocking(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
         }
 
         if (sa.usesTargeting()) {
             sa.resetTargets();
-            return tgtPlayer(ai, sa, true);
+            if (tgtPlayer(ai, sa, true)) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            }
         }
 
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     }
 
     /*

forge-ai/src/main/java/forge/ai/ability/ProtectAi.java

@@ -157,17 +157,21 @@ public class ProtectAi extends SpellAbilityAi {
     }
     
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         if (sa.usesTargeting()) {
             return protectTgtAI(ai, sa, false);
         }
 
         final List<Card> cards = AbilityUtils.getDefinedCards(sa.getHostCard(), sa.getParam("Defined"), sa);
-        if (cards.size() == 0) {
-            return false;
+        if (cards.isEmpty()) {
+            return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
         } else if (cards.size() == 1) {
             // Affecting single card
-            return getProtectCreatures(ai, sa).contains(cards.get(0));
+            if (getProtectCreatures(ai, sa).contains(cards.get(0))) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+            }
         }
         /*
          * when this happens we need to expand AI to consider if its ok
@@ -175,14 +179,14 @@ public class ProtectAi extends SpellAbilityAi {
          * control Card and Pump is a Curse, than maybe use?
          * }
          */
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
-    private boolean protectTgtAI(final Player ai, final SpellAbility sa, final boolean mandatory) {
+    private AiAbilityDecision protectTgtAI(final Player ai, final SpellAbility sa, final boolean mandatory) {
         final Game game = ai.getGame();
         if (!mandatory && game.getPhaseHandler().getPhase().isAfter(PhaseType.COMBAT_DECLARE_BLOCKERS) 
         		&& game.getStack().isEmpty()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WaitForCombat);
         }
 
         final Card source = sa.getHostCard();
@@ -216,7 +220,12 @@ public class ProtectAi extends SpellAbilityAi {
         }
 
         if (list.isEmpty()) {
-            return mandatory && protectMandatoryTarget(ai, sa);
+            if (mandatory && protectMandatoryTarget(ai, sa)) {
+                return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
+            } else {
+                sa.resetTargets();
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            }
         }
 
         while (sa.canAddMoreTarget()) {
@@ -226,11 +235,13 @@ public class ProtectAi extends SpellAbilityAi {
             if (list.isEmpty()) {
                 if ((sa.getTargets().size() < tgt.getMinTargets(source, sa)) || sa.getTargets().size() == 0) {
                     if (mandatory) {
-                        return protectMandatoryTarget(ai, sa);
+                        if (protectMandatoryTarget(ai, sa)) {
+                            return new AiAbilityDecision(50, AiPlayDecision.MandatoryPlay);
+                        }
                     }
 
                     sa.resetTargets();
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                 } else {
                     // TODO is this good enough? for up to amounts?
                     break;
@@ -242,7 +253,7 @@ public class ProtectAi extends SpellAbilityAi {
             list.remove(t);
         }
 
-        return true;
+        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
     } // protectTgtAI()
 
     private static boolean protectMandatoryTarget(final Player ai, final SpellAbility sa) {
@@ -311,11 +322,7 @@ public class ProtectAi extends SpellAbilityAi {
                 return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         } else {
-            if (protectTgtAI(ai, sa, mandatory)) {
-                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
-            } else {
-                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
-            }
+            return protectTgtAI(ai, sa, mandatory);
         }
 
         return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
@@ -324,11 +331,7 @@ public class ProtectAi extends SpellAbilityAi {
     @Override
     public AiAbilityDecision chkAIDrawback(SpellAbility sa, Player ai) {
         if (sa.usesTargeting()) {
-            if (protectTgtAI(ai, sa, false)) {
-                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
-            } else {
-                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
-            }
+            return protectTgtAI(ai, sa, false);
         }
 
         return new AiAbilityDecision(100, AiPlayDecision.WillPlay);

forge-ai/src/main/java/forge/ai/ability/PumpAi.java

@@ -56,7 +56,7 @@ public class PumpAi extends PumpAiBase {
         } else if ("Aristocrat".equals(aiLogic)) {
             return SpecialAiLogic.doAristocratLogic(ai, sa);
         } else if (aiLogic.startsWith("AristocratCounters")) {
-            return SpecialAiLogic.doAristocratWithCountersLogic(ai, sa);
+            return SpecialAiLogic.doAristocratWithCountersLogic(ai, sa).willingToPlay();
         } else if (aiLogic.equals("SwitchPT")) {
             // Some more AI would be even better, but this is a good start to prevent spamming
             if (sa.isActivatedAbility() && sa.getActivationsThisTurn() > 0 && !sa.usesTargeting()) {
@@ -114,7 +114,7 @@ public class PumpAi extends PumpAiBase {
     }
 
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final Game game = ai.getGame();
         final Card source = sa.getHostCard();
         final SpellAbility root = sa.getRootAbility();
@@ -131,14 +131,15 @@ public class PumpAi extends PumpAiBase {
         if ("Pummeler".equals(aiLogic)) {
             return SpecialCardAi.ElectrostaticPummeler.consider(ai, sa);
         } else if (aiLogic.startsWith("AristocratCounters")) {
-            return true; // the preconditions to this are already tested in checkAiLogic
+            // the preconditions to this are already tested in checkAiLogic
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         } else if ("GideonBlackblade".equals(aiLogic)) {
             return SpecialCardAi.GideonBlackblade.consider(ai, sa);
         } else if ("MoveCounter".equals(aiLogic)) {
             final SpellAbility moveSA = sa.findSubAbilityByType(ApiType.MoveCounter);
 
             if (moveSA == null) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
             }
 
             final String counterType = moveSA.getParam("CounterType");
@@ -153,7 +154,7 @@ public class PumpAi extends PumpAiBase {
                 if (cType != null) {
                     attr = CardLists.filter(attr, CardPredicates.hasCounter(cType));
                     if (attr.isEmpty()) {
-                        return false;
+                        return new AiAbilityDecision(0,AiPlayDecision.TargetingFailed);
                     }
                     CardCollection best = CardLists.filter(attr, card -> {
                         int amount = 0;
@@ -187,7 +188,7 @@ public class PumpAi extends PumpAiBase {
 
                     final Card card = ComputerUtilCard.getBestCreatureAI(best);
                     sa.getTargets().add(card);
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             } else {
                 final boolean sameCtrl = moveSA.getTargetRestrictions().isSameController();
@@ -196,7 +197,7 @@ public class PumpAi extends PumpAiBase {
                 if (cType != null) {
                     list = CardLists.filter(list, CardPredicates.hasCounter(cType));
                     if (list.isEmpty()) {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
                     }
                     List<Card> oppList = CardLists.filterControlledBy(list, ai.getOpponents());
                     if (!oppList.isEmpty() && !sameCtrl) {
@@ -232,7 +233,7 @@ public class PumpAi extends PumpAiBase {
 
                         final Card card = ComputerUtilCard.getBestCreatureAI(best);
                         sa.getTargets().add(card);
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
                 }
 
@@ -244,12 +245,12 @@ public class PumpAi extends PumpAiBase {
             int numRedMana = ComputerUtilMana.determineLeftoverMana(new SpellAbility.EmptySa(source), ai, "R", false);
             int currentPower = source.getNetPower();
             if (currentPower < 20 && currentPower + numRedMana >= 20) {
-                return true;
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
             }
         }
 
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if (!game.getStack().isEmpty() && !sa.isCurse() && !isFight) {
@@ -261,7 +262,7 @@ public class PumpAi extends PumpAiBase {
             final int activations = sa.getActivationsThisTurn();
             // don't risk sacrificing a creature just to pump it
             if (activations >= sacActivations - 1) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.ConditionsNotMet);
             }
         }
 
@@ -304,7 +305,7 @@ public class PumpAi extends PumpAiBase {
         }
 
         if ((numDefense.contains("X") && defense == 0) || (numAttack.contains("X") && attack == 0 && !isBerserk)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         //Untargeted
@@ -312,47 +313,51 @@ public class PumpAi extends PumpAiBase {
             final List<Card> cards = AbilityUtils.getDefinedCards(sa.getHostCard(), sa.getParam("Defined"), sa);
 
             if (cards.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
             }
 
             // when this happens we need to expand AI to consider if its ok for everything?
             for (final Card card : cards) {
                 if (sa.isCurse()) {
                     if (!card.getController().isOpponentOf(ai)) {
-                        return false;
+                        continue;
                     }
 
                     if (!containsUsefulKeyword(ai, keywords, card, sa, attack)) {
                         continue;
                     }
 
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
                 if (!card.getController().isOpponentOf(ai)) {
                     if (ComputerUtilCard.shouldPumpCard(ai, sa, card, defense, attack, keywords, false)) {
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     } else if (containsUsefulKeyword(ai, keywords, card, sa, attack)) {
                         if (game.getPhaseHandler().is(PhaseType.MAIN1) && isSorcerySpeed(sa, ai) ||
                                 game.getPhaseHandler().is(PhaseType.COMBAT_DECLARE_ATTACKERS, ai) ||
                                 game.getPhaseHandler().is(PhaseType.COMBAT_BEGIN, ai)) {
                             Card pumped = ComputerUtilCard.getPumpedCreature(ai, sa, card, 0, 0, keywords);
-                            return ComputerUtilCard.doesSpecifiedCreatureAttackAI(ai, pumped);
+                            if (ComputerUtilCard.doesSpecifiedCreatureAttackAI(ai, pumped)) {
+                                // If the AI can attack with the pumped creature, then it is worth playing
+                                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                            }
+                            return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
                         }
 
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     } else if (grantsUsefulExtraBlockOpts(ai, sa, card, keywords)) {
-                        return true;
+                        return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                     }
                 }
             }
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
         //Targeted
         if (!pumpTgtAI(ai, sa, defense, attack, false, false)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
-        return true;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     } // pumpPlayAI()
 
     private boolean pumpTgtAI(final Player ai, final SpellAbility sa, final int defense, final int attack, final boolean mandatory,
@@ -462,7 +467,7 @@ public class PumpAi extends PumpAiBase {
             }
 
             if (isFight) {
-                return FightAi.canFightAi(ai, sa, attack, defense);
+                return FightAi.canFightAi(ai, sa, attack, defense).willingToPlay();
             }
         }
 

forge-ai/src/main/java/forge/ai/ability/RegenerateAi.java

@@ -42,7 +42,7 @@ import java.util.List;
 public class RegenerateAi extends SpellAbilityAi {
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         final Game game = ai.getGame();
         final Combat combat = game.getCombat();
         final Card hostCard = sa.getHostCard();
@@ -54,7 +54,7 @@ public class RegenerateAi extends SpellAbilityAi {
             List<Card> targetables = CardLists.getTargetableCards(ai.getCardsIn(ZoneType.Battlefield), sa);
 
             if (targetables.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
 
             if (!game.getStack().isEmpty()) {
@@ -87,12 +87,12 @@ public class RegenerateAi extends SpellAbilityAi {
                 }
             }
             if (sa.getTargets().isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
             }
         } else {
             final List<Card> list = AbilityUtils.getDefinedCards(hostCard, sa.getParam("Defined"), sa);
             if (list.isEmpty()) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
             }
             // when regenerating more than one is possible try for slightly more value
             int numToSave = Math.min(2, list.size());
@@ -116,7 +116,11 @@ public class RegenerateAi extends SpellAbilityAi {
             chance = saved >= numToSave;
         }
 
-        return chance;
+        if (chance) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/RevealAi.java

@@ -15,20 +15,27 @@ import forge.util.MyRandom;
 public class RevealAi extends RevealAiBase {
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         // we can reuse this function here...
         final boolean bFlag = revealHandTargetAI(ai, sa, false);
 
         if (!bFlag) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         boolean randomReturn = MyRandom.getRandom().nextFloat() <= Math.pow(.667, sa.getActivationsThisTurn() + 1);
 
+        // Are we checking for runaway activations?
         if (playReusable(ai, sa)) {
             randomReturn = true;
         }
-        return randomReturn;
+
+        if (randomReturn) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        }
+
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/RevealHandAi.java

@@ -12,11 +12,11 @@ public class RevealHandAi extends RevealAiBase {
      * @see forge.card.abilityfactory.SpellAiLogic#canPlayAI(forge.game.player.Player, java.util.Map, forge.card.spellability.SpellAbility)
      */
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         final boolean bFlag = revealHandTargetAI(ai, sa, false);
 
         if (!bFlag) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
         }
 
         boolean randomReturn = MyRandom.getRandom().nextFloat() <= Math.pow(.667, sa.getActivationsThisTurn() + 1);
@@ -25,7 +25,11 @@ public class RevealHandAi extends RevealAiBase {
             randomReturn = true;
         }
 
-        return randomReturn;
+        if (randomReturn) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
+        }
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/ScryAi.java

@@ -147,10 +147,10 @@ public class ScryAi extends SpellAbilityAi {
     }
     
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         // does Scry make sense with no Library cards?
         if (ai.getCardsIn(ZoneType.Library).isEmpty()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
         }
 
         double chance = .4; // 40 percent chance of milling with instant speed stuff
@@ -181,12 +181,15 @@ public class ScryAi extends SpellAbilityAi {
         if ("X".equals(sa.getParam("ScryNum")) && sa.getSVar("X").equals("Count$xPaid")) {
             int xPay = ComputerUtilCost.getMaxXValue(sa, ai, sa.isTrigger());
             if (xPay == 0) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CantAffordX);
             }
             sa.getRootAbility().setXManaCostPaid(xPay);
         }
 
-        return randomReturn;
+        if (randomReturn) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/SetStateAi.java

@@ -17,19 +17,19 @@ import java.util.Map;
 
 public class SetStateAi extends SpellAbilityAi {
     @Override
-    protected boolean checkApiLogic(final Player aiPlayer, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player aiPlayer, final SpellAbility sa) {
         final Card source = sa.getHostCard();
         final String mode = sa.getParam("Mode");
 
         // turning face is most likely okay
         // TODO only do this at beneficial moment (e.g. surprise during combat or morph trigger), might want to reserve mana to protect them from easy removal
         if ("TurnFaceUp".equals(mode) || "TurnFaceDown".equals(mode)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
         // Prevent transform into legendary creature if copy already exists
         if (!isSafeToTransformIntoLegendary(aiPlayer, source)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WouldDestroyLegend);
         }
 
         if (sa.getSVar("X").equals("Count$xPaid")) {
@@ -38,9 +38,9 @@ public class SetStateAi extends SpellAbilityAi {
         }
 
         if ("Transform".equals(mode) || "Flip".equals(mode)) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
-        return false;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/SurveilAi.java

@@ -84,10 +84,10 @@ public class SurveilAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         // Makes no sense to do Surveil when there's nothing in the library
         if (ai.getCardsIn(ZoneType.Library).isEmpty()) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
         }
 
         // Only Surveil for life when at decent amount of life remaining
@@ -95,10 +95,11 @@ public class SurveilAi extends SpellAbilityAi {
         if (cost != null && cost.hasSpecificCostType(CostPayLife.class)) {
             final int maxLife = ((PlayerControllerAi)ai.getController()).getAi().getIntProperty(AiProps.SURVEIL_LIFEPERC_AFTER_PAYING_LIFE);
             if (!ComputerUtilCost.checkLifeCost(ai, cost, sa.getHostCard(), ai.getStartingLife() * maxLife / 100, sa)) {
-                return false;
+                return new AiAbilityDecision(0, AiPlayDecision.CostNotAcceptable);
             }
         }
 
+        // TODO If EOT and I'm the next turn, the percent should probably be higher
         double chance = .4; // 40 percent chance for instant speed
         if (isSorcerySpeed(sa, ai)) {
             chance = .667; // 66.7% chance for sorcery speed (since it will never activate EOT)
@@ -111,9 +112,10 @@ public class SurveilAi extends SpellAbilityAi {
 
         if (randomReturn) {
             AiCardMemory.rememberCard(ai, sa.getHostCard(), AiCardMemory.MemorySet.ACTIVATED_THIS_TURN);
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         }
 
-        return randomReturn;
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     @Override

forge-ai/src/main/java/forge/ai/ability/TokenAi.java

@@ -134,7 +134,7 @@ public class TokenAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(final Player ai, final SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(final Player ai, final SpellAbility sa) {
         /*
          * readParameters() is called in checkPhaseRestrictions
          */
@@ -142,14 +142,14 @@ public class TokenAi extends SpellAbilityAi {
         final Player opp = ai.getWeakestOpponent();
 
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false; // prevent infinite tokens?
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
         Card actualToken = spawnToken(ai, sa);
 
         // Don't kill AIs Legendary tokens
         if (actualToken.getType().isLegendary() && ai.isCardInPlay(actualToken.getName())) {
             // TODO Check if Token is useless due to an aura or counters?
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.WouldDestroyLegend);
         }
 
         final TargetRestrictions tgt = sa.getTargetRestrictions();
@@ -157,14 +157,18 @@ public class TokenAi extends SpellAbilityAi {
             sa.resetTargets();
 
             if (actualToken.getType().hasSubtype("Role")) {
-                return tgtRoleAura(ai, sa, actualToken, false);
+                if (tgtRoleAura(ai, sa, actualToken, false)) {
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+                } else {
+                    return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+                }
             }
 
             if (tgt.canOnlyTgtOpponent() || "Opponent".equals(sa.getParam("AITgts"))) {
                 if (sa.canTarget(opp)) {
                     sa.getTargets().add(opp);
                 } else {
-                    return false;
+                    return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                 }
             } else {
                 if (sa.canTarget(ai)) {
@@ -183,7 +187,7 @@ public class TokenAi extends SpellAbilityAi {
                     if (!list.isEmpty()) {
                         sa.getTargets().add(ComputerUtilCard.getBestCreatureAI(list));
                     } else {
-                        return false;
+                        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
                     }
                 }
             }
@@ -201,7 +205,7 @@ public class TokenAi extends SpellAbilityAi {
         }
 
         if (sa.isPwAbility() && alwaysFromPW) {
-            return true;
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
         } else if (game.getPhaseHandler().is(PhaseType.COMBAT_DECLARE_ATTACKERS)
                 && game.getPhaseHandler().getPlayerTurn().isOpponentOf(ai)
                 && game.getCombat() != null
@@ -210,14 +214,18 @@ public class TokenAi extends SpellAbilityAi {
                 && actualToken.isCreature()) {
             for (Card attacker : game.getCombat().getAttackers()) {
                 if (CombatUtil.canBlock(attacker, actualToken)) {
-                    return true;
+                    return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
                 }
             }
             // if the token can't block, then what's the point?
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.DoesntImpactCombat);
         }
 
-        return MyRandom.getRandom().nextFloat() <= chance;
+        if (MyRandom.getRandom().nextFloat() <= chance) {
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        }
+
+        return new AiAbilityDecision(0, AiPlayDecision.CantPlayAi);
     }
 
     /**

forge-ai/src/main/java/forge/ai/ability/UntapAi.java

@@ -54,19 +54,29 @@ public class UntapAi extends SpellAbilityAi {
     }
 
     @Override
-    protected boolean checkApiLogic(Player ai, SpellAbility sa) {
+    protected AiAbilityDecision checkApiLogic(Player ai, SpellAbility sa) {
         final Card source = sa.getHostCard();
 
         if (ComputerUtil.preventRunAwayActivations(sa)) {
-            return false;
+            return new AiAbilityDecision(0, AiPlayDecision.StopRunawayActivations);
         }
 
         if (sa.usesTargeting()) {
-            return untapPrefTargeting(ai, sa, false);
+            if (untapPrefTargeting(ai, sa, false)) {
+                return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+            } else {
+                return new AiAbilityDecision(0, AiPlayDecision.TargetingFailed);
+            }
         }
 
         final List<Card> pDefined = AbilityUtils.getDefinedCards(source, sa.getParam("Defined"), sa);
-        return pDefined.isEmpty() || (pDefined.get(0).isTapped() && pDefined.get(0).getController() == ai);
+        if (pDefined.isEmpty() || (pDefined.get(0).isTapped() && pDefined.get(0).getController() == ai)) {
+            // If the defined card is tapped, or if there are no defined cards, we can play this ability
+            return new AiAbilityDecision(100, AiPlayDecision.WillPlay);
+        } else {
+            // Otherwise, we can't play this ability
+            return new AiAbilityDecision(0, AiPlayDecision.MissingNeededCards);
+        }
     }
 
     @Override

forge-core/src/main/java/forge/CardStorageReader.java

@@ -253,7 +253,7 @@ public class CardStorageReader {
             sw.start();
             executeLoadTask(result, taskFiles, cdlFiles);
             sw.stop();
-            final long timeOnParse = sw.getTime();
+            final long timeOnParse = sw.getTime(TimeUnit.SECONDS);
             System.out.printf("Read cards: %s files in %d ms (%d parts) %s%n", allFiles.size(), timeOnParse, taskFiles.size(), useThreadPool ? "using thread pool" : "in same thread");
         }
 
@@ -267,7 +267,7 @@ public class CardStorageReader {
             sw.start();
             executeLoadTask(result, taskZip, cdlZip);
             sw.stop();
-            final long timeOnParse = sw.getTime();
+            final long timeOnParse = sw.getTime(TimeUnit.SECONDS);
             System.out.printf("Read cards: %s archived files in %d ms (%d parts) %s%n", this.zip.size(), timeOnParse, taskZip.size(), useThreadPool ? "using thread pool" : "in same thread");
         }