You can only use 1 'Winged Skyblaster Castel' effect per turn, and only once that turn. You can detach 1 Xyz Material from this card, then target 1 face-up monster on the field; change that monster to face-down Defense Position. You can detach 2 Xyz Materials from this card, then target 1 other face-up card on the field; shuffle that target into the Deck.
Atom 1.0
