Dark Dragon, Phantom Blaster "Diablo"

:[ 1 & Choose a face down card named "Dark Dragon, Phantom Blaster "Diablo"" from your G zone, and turn it face up], and if your G zone has two or more face up cards, 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.".