Liliana, Bolas' Harbinger

+1: Whenever a zombie you control deals combat damage this turn, draw a card.
-X: Search your library for a blue, black, or red card with converted mana cost X or less and put it into your hand. Shuffle your library.
-8: Reveal a Bolas planeswalker spell from your hand. Create X 2/2 black zombie creature tokens where X is the spells converted mana cost.