Machining Leafy

(Hand):If you have a vanguard with "Machining" in its card name, this card may be discarded as a grade 3 while you are paying the cost for . : 1 When this card is discarded from hand for the cost of of your G unit with "Machining" in its original card name, you may pay the cost. If you do, choose one of your opponent's rear-guards, and that unit cannot during your opponent's next stand phase.