* Copy spell - improved support, now all copied spells are independent (bug example: Seasons Past fizzled after copy resolve, see #7634, 10f8022043);

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

@@ -88,6 +88,8 @@ public interface Ability extends Controllable, Serializable {
     /**
      * Gets the id of the object which put this ability in motion.
      *
+     * WARNING, MageSingleton abilities contains dirty data here, so you can't use sourceId with it
+     *
      * @return The {@link java.util.UUID} of the object this ability is
      * associated with.
      */