Skeletor, Overlord of Evil

When Skeletor, Overlord of Evil enters the battlefield, if you haven't completed Tomb of Annihilation, return Skeletor, Overlord of Evil to
its owners hand and venture into the dungeon.
Whenever Skeletor, Overlord of Evil attacks, for
each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a
creature.