Performage Mirror Conductor (MP16-EN118) - 2016 Mega-Tins Mega Pack 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).
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.