Dark Dragon, Phantom Blaster "Diablo"

-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. :If your G zone has two or more face up cards, [ 1 & choose a face down "Dark Dragon, Phantom Blaster "Diablo"" from your G zone, and turn it face up], and until end of turn, this unit gets +10000/ +1, and ":When it attacks a vanguard, [choose three of your rear-guards, and retire them], and your opponent may choose two of his or her rear-guards, and retire them. If two rear-guards were not retired, your opponent cannot call cards from hand to until end of that battle.".