Zathrid, Necro-Animist

{t}: Create a 2/2 black Zombie creature token.
{b},{t}: Create a 1/1 black Zombie Assassin
creature token with deathtouch.
{b},{t}, Sacrifice a creature: Create a 3/3 black
Zombie Drake with flying.
{b}{b},{t}, Sacrifice 4 Zombies: Create a 7/7 black
Zombie Horror with trample and haste.
Death claims all, but death cannot keep all.