Gagaga Samurai

[ Warrior / Xyz / Effect ] 2 Level 4 monsters Once per turn: You can detach 1 material from this card, then target 1 "Gagaga" monster you control; it can make a second attack during each Battle Phase this turn. When another monster you control is targeted for an attack while this card is in Attack Position: You can change this card to face-up Defense Position, and if you do, change the attack target to this card and perform damage calculation. ATK/ 1900 DEF/ 1600