Poltergeist Rotom

Flying
Whenever Poltergeist Rotom deals combat
damage to a player, you may exile it. If you do,
gain control of target noncreature artifact that
player controls. That artifact's name becomes
Rotom, is a 2/2 creature in addition to its other
types and gains "When this permanent leaves
the battlefield, return Poltergeist Rotom from
exile to the battlefield under its owner's control."