Castel, the Skyblaster Musketeer

2 Level 4 monsters You can detach 1 Xyz Material from this card, then target 1 face-up monster on the field; change it 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 it into the Deck. You can only use 1 "Castel, the Skyblaster Musketeer" effect per turn, and only once that turn.