Star-vader, Freezeray Dragon

(This ability is active if you have four or more damage): When your opponent's rear-guard is locked due to an effect from one of your cards, this unit gets +3000 until end of turn. : When a card is put into your damage zone, choose up to one of your opponent's rear-guards, and lock it. (The locked card is turned face down, and cannot do anything. It turns face up at end of the owner's turn.)