Ostrak, Demon Overlord

Flying, Haste, Indestructible, Lifelink, trample

Whenever a creature dies, all demons you control
get a +1/+1 and you gain 2 life.

When Ostrak, Demon Overlord's power is 20 or
more, target player loses the game.

{1}{b}, Sacrifice a creature: You gain life equal to
the sacrificed creature's power. Create a 5/5 black
demon creature token.