Union Arena: How to Start Playing (Deck, AP Cards and Starter Deck)

There is a difference between understanding a card game and being able to play it. Union Arena has simple construction rules, but it holds one detail that catches out anyone arriving from Pokémon or One Piece: without three specific cards you cannot even begin a match, and those three cards are the rarest in the set. Let us go through what you need, in order.

Key points

1. The deck: 50 cards, one single series

The construction rule is short. The main deck holds 50 cards, split across three types — Character, Field and Event — and all of them must come from the same series. There is no mixed deck: no Bleach alongside Solo Leveling, however entertaining that would be.

The second constraint is the limit of four copies per card number, the standard across almost every modern TCG. It means the same card can go into the deck up to four times, and that a competitive deck needs multiple copies of the same key cards — not a collection of one-offs.

The practical consequence is that you choose the series before the deck. That decision binds every purchase that follows, and it is worth making it on the anime you actually like, because you will be spending time with it.

2. The AP cards: the detail nobody tells you

Beyond the deck, every player needs 3 AP cards — Action Point. They are not part of the 50: they sit apart and drive the resource mechanic. Without them the match cannot be set up.

And this is where the game plays a trick on anyone starting from boosters: AP is also the name of the game's highest rarity, the one a set holds barely a handful of types of and which comes out of packs at a very low rate. Opening displays hoping to assemble the three AP you need to play is, statistically, the most expensive possible way to begin.

Did you know?

That is exactly why Union Arena starter decks already include the AP cards you need. They are not a product “for children” or a cut-down version of the game: they are the piece that makes the rest usable. Buying a display before a starter means holding 24 packs of cards you cannot play yet.

3. The right order of purchases

Put that way, the order writes itself.

• The starter deck first, for the series you have chosen: playable the moment it is opened, it contains the AP and it tells you whether the mechanics appeal to you.
• Then the display, once you know what you are looking for: it serves to add copies of the key cards and to chase the high rarities.
• Singles last, to close the gaps in the deck without opening anything more.

This holds for any TCG, but here the first step is not optional. If your aim is purely collecting you can skip it — but then you are buying cards, not a game, and it is worth knowing that.

4. Where to look

Our Union Arena collection holds the Japanese displays series by series; availability moves in waves, as with every import product. For the wider picture of the game — how to read the set codes, what changes between the Japanese and English editions — there is the complete guide to Union Arena.

The full rulebook, with the turn flow and the play zones, is published by Bandai on the official site of the line: that is the source to consult, and it gets updated over time as in any living game.

Conclusion

Union Arena is built on three rules — 50 cards, one series only, four copies maximum — plus one requirement worth half of this article: the three AP cards. Knowing that, the cost of starting is modest and the order of purchases is obvious. Not knowing it, you risk buying in reverse.

Note: rules, product contents and the availability mentioned reflect the information available at the date of publication and may change. For the current rulebook, Bandai's official documentation prevails.