Each Build & Battle Box includes four Mega Evolution—Chaos Rising booster packs and a 40-card, ready-to-play deck featuring key cards from current and prior expansions, as well as one of four unique foil promo cards. Depending on which promo card you get, you could be playing with the devious Delphox, amped-up Ampharos, cunning Crobat, or good-natured Goodra.
