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When this creature enters, exile another target creature.
When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control.
If Faceless Butcher exiles a second Faceless Butcher, and then a third Faceless Butcher comes along and exiles the first one, the second one will return to the battlefield. If there are no other creatures on the battlefield, the second will exile the third one, returning the first one, and so on. If no one can stop the loop, the game will be a draw.