Augustus, Death's Consort

Skeleton, Zombie and Spirit creatures you control have undying. (When a creature with undying dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Whenever a creature card leaves your graveyard, create a 2/2 black Zombie creature token with decayed. (It can't block.
When it attacks, sacrifice it at the end of combat.)