Mohg, Lord of Blood

Flying, Menace.

Whenever a creature dies or is put into exile, you
gain life equal to its power.
Whenever Mhog, Lord of Blood attacks, target
opponent sacrifices a creature he or she controls
at random.
If Mohg, Lord of Blood would leave the battlefield, instead, search your library, hand, graveyard and/or
cards you own in exile for a card named "Mohg's
Great Rune" and put it onto the battlefield.