Multiple Star of Binding, Cluster Mine

(Active if you have one or more face up G units in total on your or G zone): 1 When an attack hits a vanguard during the battle that this unit boosted ([Boost]), you may pay the cost. If you do, all fighters choose one of their rear-guards, and locks it. (The locked card is turned face down, and cannot do anything. It is unlocked and turns face up at end of the owner's turn)