Lost City Dragon

: 1 When this unit intercepts ([Intercept]), you may pay the cost. If you do, choose up to one of your opponent's attacking rear-guards, your opponent returns that unit to his or her deck, searches his or her deck for up to one card a grade less than that card, calls it to , and shuffles his or her deck. (Your opponent can choose not to find a card if there is none he or she wishes to call)