Supremacy Black Dragon, Aurageyser Dragon

-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 & 1 & Choose a face down card named "Supremacy Black Dragon, Aurageyser Dragon" from your G zone, turn it face up, choose two of your rear-guards, and retire them] When this unit attacks a vanguard, you may pay the cost. If you do, reveal two cards from the top of your deck. This unit gets +5000 for each grade 1 or less card revealed with this effect until end of turn. Put the cards revealed with this effect into your hand.