Demonthrall Priestess

+1: You may pay 2 life, discard a card and/or Sacrifice a Creature, for each done, choose one: Add (B)(B), Draw 2 cards, or Gain 3 life.
-6: Create a 5/5 black Demon creature token with flying. You can tap or sacrifice up to 2 creatures, reducing the cost by 1 or 2 each respectively.
-7: Search your library for up to 4 Demon creature cards and put them onto the battlefield. Then shuffle your library.