Rampaging Hornmaw

Whenever you discard a creature card, exile that card from your graveyard. Until end of turn, you may cast that card.
Bloodrush — {1}{r}{g}, Discard Rampaging Hornmaw: Target attacking creature gets +4/+3 until end of turn.
When you discard Rampaging Hornmaw, exile it from your graveyard. Until the end of your next turn, you may cast it.