diff --git a/forge-ai/src/main/java/forge/ai/AiAttackController.java b/forge-ai/src/main/java/forge/ai/AiAttackController.java
index 8d9c231e8d7..f346e48bccd 100644
--- a/forge-ai/src/main/java/forge/ai/AiAttackController.java
+++ b/forge-ai/src/main/java/forge/ai/AiAttackController.java
@@ -45,6 +45,8 @@ import forge.util.Expressions;
 import forge.util.MyRandom;
 import forge.util.collect.FCollectionView;
 
+import static forge.ai.AiCardMemory.isMemorySetEmpty;
+
 
 //doesHumanAttackAndWin() uses the global variable AllZone.getComputerPlayer()
 /**
@@ -268,6 +270,14 @@ public class AiAttackController {
         if (ai.getGame().getPhaseHandler().getNextTurn().equals(ai)) {
             return attackers;
         }
+        // no need to block is already holding mana to cast fog next turn
+        if (!isMemorySetEmpty(ai, AiCardMemory.MemorySet.CHOSEN_FOG_EFFECT)) {
+            // Don't send the card that'll do the fog effect to attack, it's unsafe!
+            if (attackers.contains(AiCardMemory.MemorySet.CHOSEN_FOG_EFFECT)) {
+                attackers.remove(AiCardMemory.MemorySet.CHOSEN_FOG_EFFECT);
+            }
+            return attackers;
+        }
         List<Card> opponentsAttackers = new ArrayList<Card>(oppList);
         opponentsAttackers = CardLists.filter(opponentsAttackers, new Predicate<Card>() {
             @Override
diff --git a/forge-ai/src/main/java/forge/ai/ability/FogAi.java b/forge-ai/src/main/java/forge/ai/ability/FogAi.java
index 1d73d9dfa08..8c5cfeff097 100644
--- a/forge-ai/src/main/java/forge/ai/ability/FogAi.java
+++ b/forge-ai/src/main/java/forge/ai/ability/FogAi.java
@@ -3,6 +3,7 @@ package forge.ai.ability;
 
 import forge.ai.*;
 import forge.game.Game;
+import forge.game.GameObject;
 import forge.game.card.Card;
 import forge.game.card.CardPredicates;
 import forge.game.phase.PhaseType;
@@ -10,6 +11,8 @@ import forge.game.player.Player;
 import forge.game.spellability.SpellAbility;
 import forge.util.Aggregates;
 
+import java.util.List;
+
 public class FogAi extends SpellAbilityAi {
 
     /* (non-Javadoc)
@@ -18,6 +21,25 @@ public class FogAi extends SpellAbilityAi {
     @Override
     protected boolean canPlayAI(Player ai, SpellAbility sa) {
         final Game game = ai.getGame();
+        final Card hostCard = sa.getHostCard();
+
+        // Don't cast it, if the effect is already in place
+        if (game.getPhaseHandler().isPreventCombatDamageThisTurn()) {
+            return false;
+        }
+
+        // if card would be destroyed, react and use immediately if it's not own turn
+        if ((AiCardMemory.isRememberedCard(ai, hostCard, AiCardMemory.MemorySet.CHOSEN_FOG_EFFECT))
+                && (!game.getStack().isEmpty()) &&
+                (!game.getPhaseHandler().isPlayerTurn(sa.getActivatingPlayer()))
+                ) {
+            final List<GameObject> objects = ComputerUtil
+                    .predictThreatenedObjects(ai, sa);
+            if (objects.contains(hostCard)) {
+                AiCardMemory.clearMemorySet(ai, AiCardMemory.MemorySet.HELD_MANA_SOURCES_FOR_ENEMY_DECLBLK);
+                return true;
+            }
+        }
 
         // Reserve mana to cast this card if it will be likely needed
         if (((game.getPhaseHandler().isPlayerTurn(sa.getActivatingPlayer())) ||
@@ -27,7 +49,7 @@ public class FogAi extends SpellAbilityAi {
                 ) {
             ((PlayerControllerAi) ai.getController()).getAi().reserveManaSources(sa, PhaseType.COMBAT_DECLARE_BLOCKERS, true);
 
-            AiCardMemory.rememberCard(ai, sa.getHostCard(), AiCardMemory.MemorySet.CHOSEN_FOG_EFFECT);
+            AiCardMemory.rememberCard(ai, hostCard, AiCardMemory.MemorySet.CHOSEN_FOG_EFFECT);
 
         }
 
@@ -44,11 +66,6 @@ public class FogAi extends SpellAbilityAi {
             return false;
         }
 
-        // Don't cast it, if the effect is already in place
-        if (game.getPhaseHandler().isPreventCombatDamageThisTurn()) {
-            return false;
-        }
-
         if ("SeriousDamage".equals(sa.getParam("AILogic")) && game.getCombat() != null) {
             int dmg = 0;
             for (Card atk : game.getCombat().getAttackersOf(ai)) {