Encore Xyz JOTL-FR088

Target 1 face-up Xyz Monster your opponent controls with Xyz Material, detach all Xyz Materials from it, and if you do, return it to the Extra Deck, then, if there is a Monster Card in the Graveyard among those detached Xyz Materials, Special Summon as many of those monsters as possible from the Graveyard to your opponent's field in face-up Defense Position. Their Levels are reduced by 1 on the field. Cards and effects cannot be activated in response to the activation of this card.