Archdemon of Unx | Magic: The Gathering
Formats Archdemon of Unx is Legal in
Official Oracle Text for Archdemon of Unx
At the beginning of your upkeep, sacrifice a non-Zombie creature, then put a 2/2 black Zombie creature token onto the battlefield.
Official Rulings for Archdemon of Unx
10/1/2008 : If you somehow control no non-Zombie creatures when the triggered ability resolves, you won't have to sacrifice anything. You'll still get a Zombie token.