Gorthaur, the Cruel

+1: Create a 1/1 blue and black vampire creature token with flying and lifelink.
0: Gorthaur, the Cruel becomes a 4/4 legendary black and green wolf creature with trample and deathtouch until end of turn.
-X: Exile the top X cards of an opponents library. Cast one card with converted mana cost X or less from among them without paying its mana cost.