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When Undead Servant enters the battlefield, create a 2/2 black Zombie creature token for each card named Undead Servant in your graveyard.
Count the number of Undead Servants in your graveyard as the ability resolves to determine how many tokens to put onto the battlefield. If Undead Servant dies in response to its own triggered ability and is in your graveyard as that ability resolves, it will count toward the number of Zombies you get.
