Durvenuul, Land of the Dead

{t}: Add {u}{b}{r} to your mana pool, then Durvenuul, Land of the Dead deals 4 damage to you.
{u}{b}{r}{t}: Create three 2/2 Black Zombie creature tokens.
{t}: Sacrifice X Zombie Creatures. Create an X/X Black Zombie Horror creature token. If X is more than 3, it has Trample.