Special Order! Mountain Roast ~Breath of the Flame Dragon~: DZ Booster Set 01: Fated Clash

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