Special Order! Mountain Roast ~Breath of the Flame Dragon~

Play this with 2! Look at the same number of cards from the top of your deck as the number of your opponent's open , choose up to one unit card with a grade less than or equal to your vanguard from among them, call it to , and shuffle the deck. If your opponent's rear-guard was retired by your card's ability this turn, that called unit gets +5000 until end of turn.