diff --git a/forge-ai/src/main/java/forge/ai/AiProps.java b/forge-ai/src/main/java/forge/ai/AiProps.java
index dd43168d764..23b3b791fe6 100644
--- a/forge-ai/src/main/java/forge/ai/AiProps.java
+++ b/forge-ai/src/main/java/forge/ai/AiProps.java
@@ -70,6 +70,7 @@ public enum AiProps { /** */
     ALWAYS_COUNTER_AURAS ("true"), /** */
     ALWAYS_COUNTER_SPELLS_FROM_NAMED_CARDS (""), /** */
     CHANCE_TO_COPY_OWN_SPELL_WHILE_ON_STACK ("30"), /** */
+    ALWAYS_COPY_SPELL_IF_CMC_DIFF ("2"), /** */
     ACTIVELY_DESTROY_ARTS_AND_NONAURA_ENCHS ("true"), /** */
     ACTIVELY_DESTROY_IMMEDIATELY_UNBLOCKABLE ("false"), /** */
     DESTROY_IMMEDIATELY_UNBLOCKABLE_THRESHOLD ("2"), /** */
diff --git a/forge-ai/src/main/java/forge/ai/ability/CopySpellAbilityAi.java b/forge-ai/src/main/java/forge/ai/ability/CopySpellAbilityAi.java
index 8cd24cadbf2..68243a9489c 100644
--- a/forge-ai/src/main/java/forge/ai/ability/CopySpellAbilityAi.java
+++ b/forge-ai/src/main/java/forge/ai/ability/CopySpellAbilityAi.java
@@ -19,10 +19,24 @@ public class CopySpellAbilityAi extends SpellAbilityAi {
     @Override
     protected boolean canPlayAI(Player aiPlayer, SpellAbility sa) {
         Game game = aiPlayer.getGame();
-        final int chance = ((PlayerControllerAi)aiPlayer.getController()).getAi().getIntProperty(AiProps.CHANCE_TO_COPY_OWN_SPELL_WHILE_ON_STACK);
+        int chance = ((PlayerControllerAi)aiPlayer.getController()).getAi().getIntProperty(AiProps.CHANCE_TO_COPY_OWN_SPELL_WHILE_ON_STACK);
+        int diff = ((PlayerControllerAi)aiPlayer.getController()).getAi().getIntProperty(AiProps.ALWAYS_COPY_SPELL_IF_CMC_DIFF);
 
-        if (game.getStack().isEmpty()
-                || (!MyRandom.percentTrue(chance) && !"AlwaysIfViable".equals(sa.getParam("AILogic")))
+        if (game.getStack().isEmpty()) {
+            return sa.isMandatory();
+        }
+
+        final SpellAbility top = game.getStack().peekAbility();
+        if (top != null
+                && top.getPayCosts() != null && top.getPayCosts().getCostMana() != null
+                && sa.getPayCosts() != null && sa.getPayCosts().getCostMana() != null
+                && top.getPayCosts().getCostMana().getMana().getCMC() >= sa.getPayCosts().getCostMana().getMana().getCMC() + diff) {
+            // The copied spell has a significantly higher CMC than the copy spell, consider copying
+            chance = 100;
+        }
+
+        if (!MyRandom.percentTrue(chance)
+                && !"AlwaysIfViable".equals(sa.getParam("AILogic"))
                 && !"OnceIfViable".equals(sa.getParam("AILogic"))) {
             return false;
         }
@@ -35,7 +49,6 @@ public class CopySpellAbilityAi extends SpellAbilityAi {
 
         final TargetRestrictions tgt = sa.getTargetRestrictions();
         if (tgt != null) {
-            final SpellAbility top = game.getStack().peekAbility();
 
             // Filter AI-specific targets if provided
             if ("OnlyOwned".equals(sa.getParam("AITgts"))) {
diff --git a/forge-gui/res/ai/Cautious.ai b/forge-gui/res/ai/Cautious.ai
index 5a350cd968c..0e732f97963 100644
--- a/forge-gui/res/ai/Cautious.ai
+++ b/forge-gui/res/ai/Cautious.ai
@@ -136,6 +136,8 @@ ALWAYS_COUNTER_SPELLS_FROM_NAMED_CARDS=None
 # Copy spell on stack logic
 # The chance that the AI will copy its own stack right after placing it there while it has priority
 CHANCE_TO_COPY_OWN_SPELL_WHILE_ON_STACK=0
+# If the copied spell costs this much more than the copy spell, the chance to copy the spell will become 100
+ALWAYS_COPY_SPELL_IF_CMC_DIFF=4
 
 # Storm spell logic
 PRIORITY_REDUCTION_FOR_STORM_SPELLS=9
diff --git a/forge-gui/res/ai/Default.ai b/forge-gui/res/ai/Default.ai
index 61dc79aa939..8e03095a670 100644
--- a/forge-gui/res/ai/Default.ai
+++ b/forge-gui/res/ai/Default.ai
@@ -136,6 +136,8 @@ ALWAYS_COUNTER_SPELLS_FROM_NAMED_CARDS=None
 # Copy spell on stack logic
 # The chance that the AI will copy its own stack right after placing it there while it has priority
 CHANCE_TO_COPY_OWN_SPELL_WHILE_ON_STACK=30
+# If the copied spell costs this much more than the copy spell, the chance to copy the spell will become 100
+ALWAYS_COPY_SPELL_IF_CMC_DIFF=2
 
 # Storm spell logic
 PRIORITY_REDUCTION_FOR_STORM_SPELLS=0
diff --git a/forge-gui/res/ai/Experimental.ai b/forge-gui/res/ai/Experimental.ai
index ba82a3d6ae3..b5f8624f8a2 100644
--- a/forge-gui/res/ai/Experimental.ai
+++ b/forge-gui/res/ai/Experimental.ai
@@ -136,6 +136,8 @@ ALWAYS_COUNTER_SPELLS_FROM_NAMED_CARDS=None
 # Copy spell on stack logic
 # The chance that the AI will copy its own stack right after placing it there while it has priority
 CHANCE_TO_COPY_OWN_SPELL_WHILE_ON_STACK=30
+# If the copied spell costs this much more than the copy spell, the chance to copy the spell will become 100
+ALWAYS_COPY_SPELL_IF_CMC_DIFF=2
 
 # Storm spell logic
 PRIORITY_REDUCTION_FOR_STORM_SPELLS=9
diff --git a/forge-gui/res/ai/Reckless.ai b/forge-gui/res/ai/Reckless.ai
index b5b308473a4..188cf8199a9 100644
--- a/forge-gui/res/ai/Reckless.ai
+++ b/forge-gui/res/ai/Reckless.ai
@@ -136,6 +136,8 @@ ALWAYS_COUNTER_SPELLS_FROM_NAMED_CARDS=None
 # Copy spell on stack logic
 # The chance that the AI will copy its own stack right after placing it there while it has priority
 CHANCE_TO_COPY_OWN_SPELL_WHILE_ON_STACK=50
+# If the copied spell costs this much more than the copy spell, the chance to copy the spell will become 100
+ALWAYS_COPY_SPELL_IF_CMC_DIFF=1
 
 # Storm spell logic
 PRIORITY_REDUCTION_FOR_STORM_SPELLS=0
diff --git a/forge-gui/res/cardsfolder/e/echo_mage.txt b/forge-gui/res/cardsfolder/e/echo_mage.txt
index 1cd692a4dcb..755a94da0ba 100644
--- a/forge-gui/res/cardsfolder/e/echo_mage.txt
+++ b/forge-gui/res/cardsfolder/e/echo_mage.txt
@@ -6,8 +6,8 @@ K:Level up:1 U
 SVar:maxLevel:4
 S:Mode$ Continuous | Affected$ Card.Self | SetPower$ 2 | SetToughness$ 4 | AddAbility$ CopyOnce | CheckSVar$ X | SVarCompare$ EQ1 | Description$ LEVEL 2-3 2/4 CARDNAME gets U U,tap: Copy target instant or sorcery spell. You may choose new targets for the copy.
 S:Mode$ Continuous | Affected$ Card.Self | SetPower$ 2 | SetToughness$ 5 | AddAbility$ CopyTwice | CheckSVar$ Y | SVarCompare$ EQ1 | Description$ LEVEL 4+ 2/5 CARDNAME gets U U,tap:Copy target instant or sorcery spell twice. You may choose new targets for the copies.
-SVar:CopyOnce:AB$CopySpellAbility | Cost$ U U T | ValidTgts$ Instant,Sorcery | SpellDescription$ Copy target instant or sorcery spell. You may choose new targets for the copy.
-SVar:CopyTwice:AB$CopySpellAbility | Cost$ U U T | ValidTgts$ Instant,Sorcery | Amount$ 2 | SpellDescription$ Copy target instant or sorcery spell twice. You may choose new targets for the copies.
+SVar:CopyOnce:AB$CopySpellAbility | Cost$ U U T | ValidTgts$ Instant,Sorcery | AILogic$ OnceIfViable | SpellDescription$ Copy target instant or sorcery spell. You may choose new targets for the copy.
+SVar:CopyTwice:AB$CopySpellAbility | Cost$ U U T | ValidTgts$ Instant,Sorcery | Amount$ 2 | AILogic$ OnceIfViable | SpellDescription$ Copy target instant or sorcery spell twice. You may choose new targets for the copies.
 SVar:X:Count$Valid Card.Self+counters_GE2_LEVEL+counters_LT4_LEVEL
 SVar:Y:Count$Valid Card.Self+counters_GE4_LEVEL
 SVar:Picture:http://www.wizards.com/global/images/magic/general/echo_mage.jpg
diff --git a/forge-gui/res/cardsfolder/g/geistblast.txt b/forge-gui/res/cardsfolder/g/geistblast.txt
index f9771cd0695..4be13b50adf 100644
--- a/forge-gui/res/cardsfolder/g/geistblast.txt
+++ b/forge-gui/res/cardsfolder/g/geistblast.txt
@@ -2,6 +2,7 @@ Name:Geistblast
 ManaCost:2 R
 Types:Instant
 A:SP$ DealDamage | Cost$ 2 R | ValidTgts$ Creature,Player,Planeswalker | TgtPrompt$ Select any target | NumDmg$ 2 | SpellDescription$ CARDNAME deals 2 damage to any target.
-A:AB$ CopySpellAbility | Cost$ 2 U ExileFromGrave<1/CARDNAME> | ActivationZone$ Graveyard | ValidTgts$ Instant.YouCtrl,Sorcery.YouCtrl | TargetType$ Spell | SpellDescription$ Copy target instant or sorcery spell you control. You may choose new targets for the copy. 
+A:AB$ CopySpellAbility | Cost$ 2 U ExileFromGrave<1/CARDNAME> | ActivationZone$ Graveyard | ValidTgts$ Instant.YouCtrl,Sorcery.YouCtrl | TargetType$ Spell | SpellDescription$ Copy target instant or sorcery spell you control. You may choose new targets for the copy.
+SVar:AIPreference:ExileFromGraveCost$Card.Self
 SVar:Picture:http://www.wizards.com/global/images/magic/general/geistblast.jpg
 Oracle:Geistblast deals 2 damage to any target.\n{2}{U}, Exile Geistblast from your graveyard: Copy target instant or sorcery spell you control. You may choose new targets for the copy.
diff --git a/forge-gui/res/cardsfolder/l/league_guildmage.txt b/forge-gui/res/cardsfolder/l/league_guildmage.txt
index c0cdc4c664c..d8b6669129b 100644
--- a/forge-gui/res/cardsfolder/l/league_guildmage.txt
+++ b/forge-gui/res/cardsfolder/l/league_guildmage.txt
@@ -3,7 +3,7 @@ ManaCost:U R
 Types:Creature Human Wizard
 PT:2/2
 A:AB$ Draw | Cost$ 3 U T | NumCards$ 1 | SpellDescription$ Draw a card.
-A:AB$ CopySpellAbility | Cost$ X R T | ValidTgts$ Instant.YouCtrl,Sorcery.YouCtrl | TargetType$ Spell | SpellDescription$ Copy target instant or sorcery spell you control with converted mana cost X. You may choose new targets for the copy.
+A:AB$ CopySpellAbility | Cost$ X R T | ValidTgts$ Instant.YouCtrl,Sorcery.YouCtrl | TargetType$ Spell | AILogic$ OnceIfViable | SpellDescription$ Copy target instant or sorcery spell you control with converted mana cost X. You may choose new targets for the copy.
 SVar:X:Targeted$CardManaCost
 DeckHints:Type$Instant|Sorcery
 Oracle:{3}{U}, {T}: Draw a card.\n{X}{R}, {T}: Copy target instant or sorcery spell you control with converted mana cost X. You may choose new targets for the copy.
diff --git a/forge-gui/res/cardsfolder/m/meletis_charlatan.txt b/forge-gui/res/cardsfolder/m/meletis_charlatan.txt
index 02cf1a61ceb..debe3fbbc08 100644
--- a/forge-gui/res/cardsfolder/m/meletis_charlatan.txt
+++ b/forge-gui/res/cardsfolder/m/meletis_charlatan.txt
@@ -2,6 +2,6 @@ Name:Meletis Charlatan
 ManaCost:2 U
 Types:Creature Human Wizard
 PT:2/3
-A:AB$ CopySpellAbility | Cost$ 2 U T | ValidTgts$ Instant,Sorcery | TargetType$ Spell | Controller$ TargetedController | SpellDescription$ The controller of target instant or sorcery spell copies it. That player may choose new targets for the copy.
+A:AB$ CopySpellAbility | Cost$ 2 U T | ValidTgts$ Instant,Sorcery | TargetType$ Spell | Controller$ TargetedController | AILogic$ OnceIfViable | AITgts$ OwnedOnly | SpellDescription$ The controller of target instant or sorcery spell copies it. That player may choose new targets for the copy.
 SVar:Picture:http://www.wizards.com/global/images/magic/general/meletis_charlatan.jpg
 Oracle:{2}{U}, {T}: The controller of target instant or sorcery spell copies it. That player may choose new targets for the copy.
diff --git a/forge-gui/res/cardsfolder/m/mirror_sheen.txt b/forge-gui/res/cardsfolder/m/mirror_sheen.txt
index 4cf65e9c34c..490e40e5ba2 100644
--- a/forge-gui/res/cardsfolder/m/mirror_sheen.txt
+++ b/forge-gui/res/cardsfolder/m/mirror_sheen.txt
@@ -1,6 +1,6 @@
 Name:Mirror Sheen
 ManaCost:1 UR UR
 Types:Enchantment
-A:AB$ CopySpellAbility | Cost$ 1 UR UR | ValidTgts$ Instant,Sorcery | TargetType$ Spell | TargetValidTargeting$ You | SpellDescription$ Copy target instant or sorcery spell that targets you. You may choose new targets for the copy.
+A:AB$ CopySpellAbility | Cost$ 1 UR UR | ValidTgts$ Instant,Sorcery | TargetType$ Spell | TargetValidTargeting$ You | AILogic$ AlwaysIfViable | SpellDescription$ Copy target instant or sorcery spell that targets you. You may choose new targets for the copy.
 SVar:Picture:http://www.wizards.com/global/images/magic/general/mirror_sheen.jpg
 Oracle:{1}{U/R}{U/R}: Copy target instant or sorcery spell that targets you. You may choose new targets for the copy.
diff --git a/forge-gui/res/cardsfolder/t/tawnos_urzas_apprentice.txt b/forge-gui/res/cardsfolder/t/tawnos_urzas_apprentice.txt
index f370baa2447..5aa503852fe 100644
--- a/forge-gui/res/cardsfolder/t/tawnos_urzas_apprentice.txt
+++ b/forge-gui/res/cardsfolder/t/tawnos_urzas_apprentice.txt
@@ -3,5 +3,5 @@ ManaCost:U R
 Types:Legendary Creature Human Artificer
 PT:1/3
 K:Haste
-A:AB$ CopySpellAbility | Cost$ U R T | TargetType$ Activated.YouCtrl,Triggered.YouCtrl | ValidTgts$ Artifact | SpellDescription$ Copy target activated or triggered ability you control from an artifact source. You may choose new targets for the copy. (Mana abilities can't be targeted.)
+A:AB$ CopySpellAbility | Cost$ U R T | TargetType$ Activated.YouCtrl,Triggered.YouCtrl | ValidTgts$ Artifact | AILogic$ OnceIfViable | SpellDescription$ Copy target activated or triggered ability you control from an artifact source. You may choose new targets for the copy. (Mana abilities can't be targeted.)
 Oracle:Haste\n{U}{R}, {T}: Copy target activated or triggered ability you control from an artifact source. You may choose new targets for the copy. (Mana abilities can't be targeted.)