Carapace Mutant Deity, Machining Destroyer

(Released when both players' vanguards are grade 3 or greater!)-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] this card on your from face down. : 1-card with "Machining"in its card name] If you have a heart card with "Machining" in its card name, choose one of your opponent's rear-guards, and that unit cannot during your opponent's next stand phase. Then, if the number of rear-guards you have with "Machining" in its card name is four or more, choose one of your opponent's vanguards, and that unit cannot during your opponent's next stand phase.