Liliana, Veil-Taken

+1: Create 2 2/2 black zombie creature tokens.
-3: Create a 5/5 black demon with flying and: "At the beginning of your upkeep, sacrifice another creature. If you don't, you lose 5 life."
-6: Whenever you cast a demon or zombie spell this turn, search your library for a demon or zombie card and put that card onto the battlefield.