Muzan Kibutsiji

+1: Put a +1/+1 counter on target demon you control. If it has bloodthirst put two +1/+1 counters instead
0: Unil your next turn, Muzan becomes a 12/12 demon with "if a source would deal damage to this creature prevent it and put a -1/-1 counter on it"
-9: Search in your library for up to 6 demon cards and put them on the battlefield under your control