Wilhelt, the Rotcleaver

Whenever another Zombie you
control dies, if it didn't have decayed,
create a 2/2 black Zombie creature
token with decayed.
At the beginning of your end step,
you may sacrifice a Zombie.
If you do, draw a card.
"Every day humans come one step closer to self destruction.
I'm not destroying the world, I'm saving it!"
-Albert Wesker