Fix #8485

Mage/src/main/java/mage/abilities/AbilityImpl.java

@@ -253,14 +253,6 @@ public abstract class AbilityImpl implements Ability {
         }
         setSourcePermanentTransformCount(game);
 
-        /* 20130201 - 601.2b
-         * If the player wishes to splice any cards onto the spell (see rule 702.45), he
-         * or she reveals those cards in their hand.
-         */
-        if (this.abilityType == AbilityType.SPELL) {
-            game.getContinuousEffects().applySpliceEffects(this, game);
-        }
-
         // if ability can be cast for no mana, clear the mana costs now, because additional mana costs must be paid.
         // For Flashback ability can be set X before, so the X costs have to be restored for the flashbacked ability
         if (noMana) {
@@ -277,12 +269,24 @@ public abstract class AbilityImpl implements Ability {
             }
         }
 
+        // fused or spliced spells contain multiple abilities (e.g. fused, left, right)
+        // optional costs and cost modification must be applied only to the first/main ability
+        boolean isMainPartAbility = !CardUtil.isFusedPartAbility(this, game);
+
+        /* 20220908 - 601.2b
+         * If the player wishes to splice any cards onto the spell (see rule 702.45), they
+         * reveal those cards in their hand.
+         */
+        if (isMainPartAbility && this.abilityType == AbilityType.SPELL) {
+            game.getContinuousEffects().applySpliceEffects(this, game);
+        }
+
         // 20130201 - 601.2b
         // If the spell has alternative or additional costs that will be paid as it's being cast such
         // as buyback, kicker, or convoke costs (see rules 117.8 and 117.9), the player announces his
         // or her intentions to pay any or all of those costs (see rule 601.2e).
         // A player can't apply two alternative methods of casting or two alternative costs to a single spell.
-        if (!activateAlternateOrAdditionalCosts(sourceObject, noMana, controller, game)) {
+        if (isMainPartAbility && !activateAlternateOrAdditionalCosts(sourceObject, noMana, controller, game)) {
             if (getAbilityType() == AbilityType.SPELL
                     && ((SpellAbility) this).getSpellAbilityType() == SpellAbilityType.FACE_DOWN_CREATURE) {
                 return false;
@@ -385,12 +389,8 @@ public abstract class AbilityImpl implements Ability {
             return false;
         }
 
-        // fused spell contains 3 abilities (fused, left, right)
-        // fused cost added to fused ability, so no need cost modification for other parts
-        boolean needCostModification = !CardUtil.isFusedPartAbility(this, game);
-
         //20101001 - 601.2e
-        if (needCostModification) {
+        if (isMainPartAbility) {
             adjustCosts(game); // still needed for CostAdjuster objects (to handle some types of dynamic costs)
             game.getContinuousEffects().costModification(this, game);
         }

Mage/src/main/java/mage/abilities/effects/ContinuousEffects.java

@@ -765,15 +765,6 @@ public class ContinuousEffects implements Serializable {
     public void applySpliceEffects(Ability abilityToModify, Game game) {
         // add effects from splice card to spell ability on activate/cast
 
-        // splice spell - spell can't be spliced again
-        if (CardUtil.isSpliceAbility(abilityToModify, game)) {
-            return;
-        }
-        // fused spell - can be spliced only to main fused ability, not to parts
-        if (CardUtil.isFusedPartAbility(abilityToModify, game)) {
-            return;
-        }
-
         List<SpliceCardEffect> spliceEffects = getApplicableSpliceCardEffects(game, abilityToModify.getControllerId());
         // get the applyable splice abilities
         List<Ability> spliceAbilities = new ArrayList<>();

Mage/src/main/java/mage/abilities/keyword/SpliceOntoArcaneAbility.java

@@ -1,4 +1,3 @@
-
 package mage.abilities.keyword;
 
 import java.util.Iterator;
@@ -9,6 +8,7 @@ import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.costs.Cost;
 import mage.abilities.costs.Costs;
 import mage.abilities.costs.CostsImpl;
+import mage.abilities.costs.mana.ManaCost;
 import mage.abilities.costs.mana.ManaCostsImpl;
 import mage.abilities.effects.SpliceCardEffectImpl;
 import mage.cards.Card;
@@ -147,7 +147,12 @@ class SpliceOntoArcaneEffect extends SpliceCardEffectImpl {
                 splicedAbility.setSourceId(abilityToModify.getSourceId());
                 spell.addSpellAbility(splicedAbility);
                 for (Iterator it = ((SpliceOntoArcaneAbility) source).getSpliceCosts().iterator(); it.hasNext();) {
-                    spell.getSpellAbility().getCosts().add(((Cost) it.next()).copy());
+                    Cost cost = (Cost) it.next();
+                    if (cost instanceof ManaCost) {
+                        spell.getSpellAbility().getManaCostsToPay().add((ManaCost) cost.copy());
+                    } else {
+                        spell.getSpellAbility().getCosts().add(cost.copy());
+                    }
                 }
             }
             return true;

Mage/src/main/java/mage/abilities/keyword/SpliceOntoInstantOrSorceryAbility.java

@@ -7,6 +7,7 @@ import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.costs.Cost;
 import mage.abilities.costs.Costs;
 import mage.abilities.costs.CostsImpl;
+import mage.abilities.costs.mana.ManaCost;
 import mage.abilities.costs.mana.ManaCostsImpl;
 import mage.abilities.effects.SpliceCardEffectImpl;
 import mage.cards.Card;
@@ -150,7 +151,12 @@ class SpliceOntoInstantOrSorceryEffect extends SpliceCardEffectImpl {
                 splicedAbility.setSourceId(abilityToModify.getSourceId());
                 spell.addSpellAbility(splicedAbility);
                 for (Iterator it = ((SpliceOntoInstantOrSorceryAbility) source).getSpliceCosts().iterator(); it.hasNext(); ) {
-                    spell.getSpellAbility().getCosts().add(((Cost) it.next()).copy());
+                    Cost cost = (Cost) it.next();
+                    if (cost instanceof ManaCost) {
+                        spell.getSpellAbility().getManaCostsToPay().add((ManaCost) cost.copy());
+                    } else {
+                        spell.getSpellAbility().getCosts().add(cost.copy());
+                    }
                 }
             }
             return true;

Mage/src/main/java/mage/util/CardUtil.java

@@ -911,27 +911,22 @@ public final class CardUtil {
         return Outcome.BoostCreature;
     }
 
-    public static boolean isSpliceAbility(Ability ability, Game game) {
-        if (ability instanceof SpellAbility) {
-            return ((SpellAbility) ability).getSpellAbilityType() == SpellAbilityType.SPLICE;
-        }
-        return false;
-    }
-
     public static boolean isFusedPartAbility(Ability ability, Game game) {
         // TODO: does it work fine with copies of spells on stack?
-        if (ability instanceof SpellAbility) {
+        if (!(ability instanceof SpellAbility)) {
+            return false;
+        }
+        if (((SpellAbility) ability).getSpellAbilityType() == SpellAbilityType.SPLICE) {
+            return true;
+        }
         Spell mainSpell = game.getSpell(ability.getId());
         if (mainSpell == null) {
             return true;
-            } else {
+        }
         SpellAbility mainSpellAbility = mainSpell.getSpellAbility();
         return mainSpellAbility.getSpellAbilityType() == SpellAbilityType.SPLIT_FUSED
                 && !ability.equals(mainSpellAbility);
     }
-        }
-        return false;
-    }
 
     public static Abilities<Ability> getAbilities(MageObject object, Game game) {
         if (object instanceof Card) {