Performage Mirror Conductor - MP16-EN118 - Common - Unlimited

[ Pendulum Effect ]
Once per turn: You can target 1 face-up Special Summoned monster on the field; its ATK and DEF become equal to its current ATK or DEF (whichever is lower) until the end of this turn (even if this card leaves the field).
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[ Monster Effect ]
Once per turn, during either player's turn: You can target 1 face-up monster on the field; switch its current ATK and DEF, then take 500 damage. This ATK and DEF change lasts until the end of this turn.