Shadow-eater

Lifelink
When Shadow-eater enters the battlefield, exile X
nonland permanents. If Shadow-eater would destroy
a creature during combat, exile that creature instead.
You may cast cards exiled via either of these ways
without paying their mana cost. You lose life equal
to the converted mana cost of the cards you play in
this way.
Shadow-eaters power and toughness are equal to the number of cards in your opponents exile.