Xeran, Master of Undeath

+2: Put a -1/-1 counter on target creature, if that creature is a zombie you control and it would die this turn, draw a card.
0: Xeran becomes a 2/1 black creature with Indestructible and "zombie creatures you control get +1/+1" until your next turn.
-X: Return a creature with converted mana cost X or less from your graveyard to the battlefield under your control tapped.