But it would be rather silly, no? Also, would the hp go back? I mean, if you are almost dying, 1 hp left - CAVEMAN TURNS INTO {x} all hp comes back? I think Caveman itself should have more Hp and less attack, and {x} more attack and less hp. It would adapt itself very well with the battlefield. But once you turn it into X it can't go back. Otherwise the hp would come back and you would be unstoppable (No gravity pun intended.)