Steam Maiden, Danish

(This ability is active if you have one or more face up G units in total on your or G zone):When this unit is placed on , choose one of your opponent's rear-guards, your opponent returns that unit to his or her deck, searches his or her deck for up to one card with grade -1 than that unit, 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)