Cradle of the Stars, Stellar Maker

(This ability is active if you have one or more face up G units in total on your or G zone):When this unit attacks a vanguard, choose up to two locked cards, and you may unlock them. If two cards were unlocked, this unit gets +3000/Critical+1 until end of that battle. :[ 1 & 1] When this unit is placed on , you may pay the cost. If you do, choose one of your opponent's rear-guards in the back row, 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.)