Star-vader, Craving Claw

/:When its attack or the attack it boosted hits a vanguard, look at five cards from the top of your deck, reveal up to one card with "Star-vader" in its card name from among them and put it into your hand, and shuffle your deck. :If your opponent's vanguard is grade 3 or greater, [put this unit into the soul], choose up to one of your opponent's locked cards, and unlock it. If you unlocked a card, choose one of your opponent's rear-guards other than that unlocked unit, and lock it.