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