A new lab member is joining the Union Arena lineup. Steins;Gate makes its debut in Bandai's crossover TCG with UNION ARENA BOOSTER PACK Steins;Gate [UA57BT], releasing October 16, 2026. This marks the first time the beloved TV anime has participated in the game, and for players new to the title, a quick primer: Union Arena is Bandai's multi-anime IP crossover card game, where worlds like Steins;Gate share the table with fighters and heroines from many other series.
This fan hub is unofficial, so treat everything here as a reader's guide — confirm every detail on the official website before you spend.
What's in the box
Each pack holds 8 cards, and each box holds 16 packs. Card types are random, as is standard for the game, so there is no fixed guarantee of what you will pull in any single pack. The set is built around the standard rarity ladder and a supporting card type:
- SR (Super Rare): 12 types
- R (Rare): 12 types
- U (Uncommon): 28 types
- C (Common): 28 types
- AP (Action Point): 12 types
Parallel rare cards are also included in the set, giving collectors the usual chase beyond the base lineup.
Autograph cards
Foil-stamped autograph (signature) cards feature the anime cast. Confirmed voice actors credited on these cards are Okabe Rintaro (Mamoru Miyano), Shiina Mayuri (Kana Hanazawa), Makise Kurisu (Asami Imai), Kiryu Moeka (Saori Goto), Urushibara Ruka (Yu Kobayashi), Faris NyanNyan (Haruko Momoi), and Amane Suzuha (Yukari Tamura). If these names are new to you, these signed cards double as both game pieces and collectibles.
Brand-new art
The set carries brand-new original illustrations by the illustrator team, and they spotlight the main lab crew: Okabe Rintaro, Shiina Mayuri, Hashida Itaru, Makise Kurisu, Kiryu Moeka, Urushibara Ruka, Faris NyanNyan, and Amane Suzuha. For fans who already own other Steins;Gate merchandise, these pieces are fresh takes rather than recycled artwork.
Serial-numbered AP cards
A special campaign targets AP (Action Point) cards. Limited AP cards with serial numbers appear at a very low rate and in limited quantities — in other words, they are genuinely scarce pulls. These serial-numbered AP cards are autographed by the cast. One honest caveat the official campaign notes: whether these serial-numbered cards appear in resale is undecided, so if you are hunting them through secondary markets, expect uncertainty and confirm current status with the official site.
Final word
October 16, 2026 is the date to mark. If you are new to Union Arena, this is a friendly entry point — a fresh IP debut with autographs, original art, and a modest mystery in those serial AP cards. As always with a card game of this kind, pack contents are random, so treat pull lists as probability, not promise. This is an unofficial fan hub, so please double-check card lists, rarities, and campaign terms against the official UNION ARENA news before relying on anything here.