The Scarab God's Emissary

Decay

Whenever you create a zombie, exile the top card of your library, you may play that card this turn. If the card exiled has a converted mana cost of 3 or less, you may play it without paying its mana cost.

{1}{w}{u}{b}, create a 4/4 black zombie creature token with decay (Whenever this creature attacks, put a
-1/-1 counter on it. If it would die, exile it instead).