Gagaku-P.U.N.K. Wild Picking

At the start of the Damage Step, if your "P.U.N.K." monster battles an opponent's monster: You can destroy that opponent's monster. You can only use this effect of "Gagaku-P.U.N.K. Wild Picking" once per turn. If this card in its owner's Spell & Trap Zone is destroyed by an opponent's card effect: You can activate this effect; "P.U.N.K." monsters you currently control cannot be destroyed by battle this turn.