Geralf's Mindcrusher is a rare Creature — Zombie Horror card from Dark Ascension (DKA), collector number 37. Current market price: $0.32 (foil $0.45), TCGplayer market prices via Scryfall.
When this creature enters, target player mills five cards. Undying (When this creature 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.)