Vikrath, the Void Tyrant

Flying, Trample
Feed on the Void-{b}{b}{b}{b} Sacrifice a nontoken
Abyssal creature you control, this creature gets
+X/+X until end of turn, where X is equal to
the sacrificed creature's power
Flaming Void-Whenever an Abyssal creature you control dies, creatures an opponent controls
get -1/-1 and if any creatures die this way, they
are exiled