Conquering Supreme Dragon, Exterminate 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. :When this unit is placed on , 1, and draw a card for each of your opponent's open front row . : 1, and all of your front row units get +10000 until end of turn for each of your opponent's open front row .