Goblin Bikers Gone Bonkers

2+ Level 6 monsters
You can target face-up monsters your opponent controls up to the number of "Goblin" monsters you control; detach 1 Xyz Material from your monster, and if you do, attach those targets to this card as material. During your opponent's turn (Quick Effect): You can target cards your opponent controls up to the number of "Goblin" Xyz Monsters you control; detach 3 Xyz Materials from your monsters, and if you do, send those targets to the GY. You can only use each effect of "Goblin Bikers Gone Bonkers" once per turn.