Death Star-vader, Chaos Universe

-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] this card on your from face down. :[ 1 & Choose a face down card named "Death Star-vader, Chaos Universe" from your G zone, and turn it face up] If you have a heart card with "Chaos" in its card name, 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. If your G zone has two or more face up cards, choose up to one of your opponent's rear-guards, and lock it.