Mikaeus, the Unhallowed is a mythic Legendary Creature — Zombie Cleric card from Ultimate Masters (UMA), collector number 106. Current market price: $23.25 (foil $44.00), TCGplayer market prices via Scryfall.
Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.) Whenever a Human deals damage to you, destroy it. Other non-Human creatures you control get +1/+1 and 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.)