2 Level 3 monsters
If this card is Xyz Summoned: You can add 1 "Goblin" monster from your Deck to your hand. If material is detached from a monster(s) on the field (except during the Damage Step): You can target 1 face-up monster on the field, except this card; attach it to this card as material. During the End Phase: You can attach 1 "Goblin" monster from your Deck to this card as material. You can only use each effect of "Goblin Biker Big Gabonga" once per turn.
