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Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control and you create a Treasure token." (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")
If the target creature is a token, the ability still triggers when it dies. Its controller won't return the token to the battlefield, but they will creature a Treasure token.
The Treasure token is created by the creature's controller, who may be different from Fake Your Own Death's controller and may be different from the creature's owner.
