Seal Dragon, Corduroy

: 1-card with "Seal Dragon" in its card name] When this unit is placed on or , if you have a Kagero vanguard, you may pay the cost. If you do, choose one of your opponent's rear-guards, retire it, and your opponent looks at up to four cards from the top of his or her deck, searches for up to one grade 2 unit, calls it to , and shuffles his or her deck.