The Night King

Whenever another Zombie you control dies, if it
didn't have decayed, create a 2/2 black Zombie creature token with decayed. (It can't block.
When it attacks, sacrifice it at end of combat.)

At the beginning of your end step, you may sacrifice a Zombie. If you do, draw a card.

"The true enemy won't wait out the storm. He brings the storm." - Jon Snow