Legendary Creature — Zombie Wizard
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When Acererak the Archlich enters the battlefield, if you haven't completed Tomb of Annihilation, return Acererak the Archlich to its owner's hand and venture into the dungeon.
Whenever Acererak the Archlich attacks, for each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a creature.
If Acererak is no longer on the battlefield as its first ability resolves and you haven't completed Tomb of Annihilation, you will still venture into the dungeon.