Conquering Supreme Dragon, Exterminate Dragon D-PS01/011 RRR

[Stride]-Stride Step-COST [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]:When this unit is placed on (VC), COST [Soul Blast (1)], and draw a card for each of your opponent's front row open (RC). [ACT](VC)1/Turn:COST [Counter Blast (1)], and all of your front row units get [Power]+10000 until end of turn for each of your opponent's front row open (RC).