Aethermaw

Trample, Hexproof, Indestructible
This spell can't be countered.
When Aethermaw enters the battlefield, you may
exile any number of cards from your hand, graveyard, and permanents you control.
Aethermaw enters the battlefield with a +1/+1
counter on it for each card exiled this way.
Aethermaw knows no enemies.