Crumena, the Raven King

+2: Search your library for a creature, sorcery, or instant card. Reveal it, and then put it into your hand.
-3: Place a card from your graveyard back into your hand.
-12: You get an Emblem with "Spells you have can be cast for 3 colorless mana, and when you have no cards you draw 7 at your next draw step.