Angelic Balance Mender

Flying, vigilance
When Angelic Balance Mender enters the battlefield, if an opponent controls more creatures than you, that player separates each creature he or she controls into two piles. That player then chooses a pile of his or her choice. Angelic Balance Mender deals damage equal to its power to each creature in the chosen pile. That player then chooses a creature from the pile that wasn't chosen and sacrifices it.