Supremacy Black Dragon, Aurageyser Dragon (G-BT10/Re:01EN) [Raging Clash of the Blade Fangs]

[Stride]-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] Stride this card on your (VC) from face down. [AUTO](VC): [Counter Blast (1) & Soul Blast (1) & Choose a face down card named "Supremacy Black Dragon, Aurageyser Dragon" from your G zone, and 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 [Power]+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.