Graz't, Envoy of Phyrexia

+1: Put a loyalty counter on Graz't, Envoy of Phyrexia unless target opponent sacrifices a creature.
-X: Each player loses X life. If this ability would cause you to lose the game, your life total becomes X.
-8: Search each opponent's library for 8 cards and exile them. Then each opponent shuffles his or her library