Dahirri, Matriarch of Chaos

First Strike, Menace, Haste
Dahirri, Matriarch of Chaos gets -1/-0 for each card in your hand.
When Hellbent attacks, exile cards from the top of your library equal to its power. You may play those cards this turn.

Hellbent —Whenever you cast a spell from exile, Dahirri deals 2 damage to any target and spells you cast from exile cost {2}less if you have no cards in hand.