Xyz Encore

Target 1 face-up Xyz Monster your opponent controls that has material; detach all materials from it, and if you do, return it to the Extra Deck, then, if there is a Monster Card in the GY among those detached materials, Special Summon as many of those monsters as possible from the GY to your opponent's field in face-up Defense Position. Their Levels are reduced by 1 on the field. Neither player can activate cards or effects in response to this card's activation.