remove isXCost

forge-game/src/main/java/forge/game/trigger/WrappedAbility.java

@@ -308,11 +308,6 @@ public class WrappedAbility extends Ability {
         return sa.isSpell();
     }
 
-    @Override
-    public boolean isXCost() {
-        return sa.isXCost();
-    }
-
     @Override
     public String getSVar(String name) {
         return sa.getSVar(name);