Union Arena - Full Metal Alchemist - Booster Box [JP]Each Booster Pack contains 12 cards. There are 4 rarity levels: Common (C), Uncommon (U), Rare (R), and Super Rare (SR), with AP cards included at a low pull rate. The lineup features a total of 100 card types plus 6 types of AP cards. Additionally, alt art cards are also included! Power up your favorite deck and make playing UNION ARENA even more exciting!