Witches Can Spawn Skeletons from fallen warriors from previous opponents battles

You know how when you get attacked there's tombstones left behind of the enemies you've defeated and how if someone doesn't clean their base when you attack them sometimes they still have tombstones scattered... well my idea is to add an automatic ability to witches that (in addition to the skeletons she can summon) if your opponent has not cleaned them up, an attacking player can play a witch and any that are there she can summon back to the battle as skeletons in addition to the ones she can normally summon. in order to make it a non infinite loop attack and fair she'd only be able to summon back those that fell in the opponents previous battles that haven't been cleared (not any from the current battle).

This will be great