Union Arena - That Time I Got Reincarnated as a Slime Booster Box

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 188 card types plus 13 types of AP cards.
Additionally, alt-art cards are also included!