Arena mode consists of several consecutive matches against other players. Rather than using one of the your already-constructed decks, you choose one of three offered classes to play as, and will be given a selection of cards within that class to build a 30-card deck from, which will last only through the remainder of the arena. There are three types of arena available:
- Solo Arena — A mode involving consecutive matches and deck building against the AI
- Versus Arena — A mode involving consecutive matches and deck building against other players
- Chaos Arena — A monthly event that alters the arena modes