The World's #1 Online TCG Simulator
play union arena
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Sim Version
Server Version
online simulator
Full-featured Union Arena simulator with ban lists and smooth gameplay
ranked play
Climb the ladder, earn ranks, and prove you're the best!
deck builder
Powerful deck builder with stats, exburst sync, and NA/Asia formats.
hosted tournaments
Join community tournaments with exciting prizing!
item shop
Browse exclusive digital card sleeves, playmats and player cosmetics.
community
Connect with players, share decks, and grow the community!
Guides & Resources
How to Play (Plain-Language)
Our own walkthrough of deck building, the board, turn structure, and combat - written for players learning the game.
Guide
Cardboard Kitsune FAQ
Answers to the questions we hear most about the simulator itself - accounts, decks, matches, and support.
FAQ
Card Glossary
A quick-reference glossary for every stat, zone, and keyword you will run into while playing.
Reference
Deck Building Basics
Learn the basics of deck building in Union Arena and get started with confidence.
Guide
Learn to play Union Arena
Learn the basics of gameplay in Union Arena TCG by using the officially licensed tutorial app.
External Resource
Union Arena Rules Reference
Official rules reference and important game mechanics.
External Resource
Union Arena Ruling FAQ
Frequently asked questions on rulings and interactions.
External Resource
Patch Notes
No patch notes yet.
Cardboard
Kitsune
The world's first simulator for the Union Arena trading card game.
Cards generously provided by
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