Learn

Guides & resources.

Everything you need to learn Union Arena, build a deck that works, and keep up with what's new on Cardboard Kitsune - all in one place.

How to Play

Deck building, the board, turn structure, combat, and Triggers - a full rules primer for players learning Union Arena.

Core deck stats, archetypes, and a practical testing checklist for turning a pile of cards into a real game plan.

A quick-reference glossary of every stat, zone, and keyword you will run into while playing - Get, Draw, Raid, Sideline, and more.

Answers to the questions we hear most, from account and matchmaking basics to general Union Arena rules questions.

What has changed on Cardboard Kitsune recently - new features, balance updates, and bug fixes as they ship.

Jump straight into the Deck Builder, or find an open match in the Lobby.

The world's first simulator for the Union Arena trading card game.

Cards generously provided by