Castel, the Skyblaster Musketeer [DUSA-EN093] Ultra Rare Shonen Jump Magazine Promos Once per turn (Quick Effect):

Once per turn (Quick Effect): You can pay 1000 LP

based on its type apply this effect

your battling monster gains that much ATK/DEF during that damage calculation only

destroy as many monsters you control as possible

Castel, the Skyblaster Musketeer [DUSA-EN093] Ultra Rare Shonen Jump Magazine Promos Once per turn (Quick Effect):Set: Duelist Saga Card type: Xyz Effect Monster Rarity: Ultra Rare Attack: 2000 Defense: 1500 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