Entreri, Vicious Necromant

Deathtouch.
Whenever Entreri, Vicious Necromant enters the battlefield, destroy one creature.
Then, it's controller creates a 2/2 Zombie.
{b}{b}{t}: Destroy a creature. It's controller creates a
X/X creature, where X is the converted mana cost of
that creature.
{10}{b}{b}{b}:Exile all creatures. For each creature
exiled that way, create one 2/2 Zombies.