:[Counter Blast (2)-cards with "Star-vader" in its card name] When this unit is placed on
, if you have a vanguard with "Star-vader" in its card name, and your opponent has a locked card, you may pay the cost. If you do, choose up to one of your opponent's open
, your opponent chooses a card from his or her hand, and puts it on that
face down as a locked card.