Photon Timestop

Take 1 "Photon" or "Galaxy" Continuous Spell/Trap from your Deck and either add it to your hand or place it face-up on your field. If this Set card in its owner's control is destroyed by your opponent's card effect during your opponent's turn and you control "Galaxy-Eyes Photon Dragon" or an Xyz Monster that has it as material: You can activate this effect; it becomes the End Phase of this turn.