Yhorm, Profane Lord

Trample, Menace

Loneliest Lord—Yhorm can only attack alone. When he does, you may exile the top card of your library. You may play that card until the end of your next turn.

The Profane Flame—Whenever you cast a spell from exile, each opponent loses life equal to the mana value of
the exiled spell. If you play a land from exile, each opponent sacrifices a creature.