Each Build & Battle Box includes four Scarlet & Violet—Paldea Evolved booster packs and a 40-card ready-to-play deck featuring key cards from current and prior sets, as well as one of four unique foil promo cards to boost your Prerelease deck. Depending on which promo card you get, you could add the stone-cold Baxcalibur, terrifyingly cute Tinkaton, mighty Murkrow, or helpful Pelipper. Whichever promo you do end up with, it will certainly shape your Prerelease strategy!