Lost City Dragon

[AUTO] Generation Break 1 :[Counter Blast (1)] When this unit intercepts, 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 that is a grade less than that unit, calls it to (RC), 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)