Knight of Blackness of Yore Undercover, Obscudeid

(Gauge Zone):If this card is an undercover gauge, 1, and call this card to a back row center . :If you have a grade 3 or greater vanguard with "Undercover" in its card name, this unit can attack from the back row center column, and gets +10000. (Active on opponent's turn too) :When this unit attacks from the back row center column, if you have a grade 3 or greater vanguard with "Undercover" in its card name, your opponent's vanguard is grade 3 or greater, and no drive checks were performed for the battle your rear-guard attacked this turn, 1, and until end of that battle, this unit performs drive checks, and gets drive -1. At the end of that battle, put this unit on the bottom of the deck.