Cookie Run: Braverse Festival Arena (BS12) Card List

On August 31, 2026, 148 new rows appeared in the official CookieRun: Braverse English card database. All of them carry the product name BOOSTER PACK [Festival Arena] and the card-number prefix BS12. That is the twelfth booster set, and it is not out yet.

That gap is the whole reason this post exists. Devsisters has filed 112 numbered cards with name, level, HP, colour, rarity, rules text and artwork — a month before anyone can buy a pack. So there is a lot that can be said accurately right now, and a lot that cannot. This post sticks to the first category.

What is confirmed, and what is not

Confirmed, from Devsisters' Community Letter of July 23, 2026: Booster 12 [Festival Arena] has a pre-release on September 26 and an official release on October 2, 2026.

Confirmed, from the card database itself: the 148 entries listed below, exactly as the publisher filed them.

Not confirmed, and not claimed here: anything about how this set plays. No card in it has been legal in a sanctioned event. There are no results, no win rates, no decklists, and no consensus about what is strong. Any article telling you which Festival Arena cards are "must-haves" is guessing. When the set has actually been played, that will be worth writing about; today it is not.

Not the whole set, either. The database publishes a numbered subset of each booster rather than its full print run. It lists 116 numbered cards for Booster 11, while Devsisters' launch materials for that set advertised 305 cards, 66 of them Hidden — and not one row in the database, across all 2,243 of them and every set, is flagged as a Hidden card. The July letter says Festival Arena's Hidden cards will carry the Cookies' signatures, so those exist and are not in the feed. Read 112 as what the publisher has filed, not as the size of the retail set; our Dark Enchantress War set guide works through that gap in detail.

One more honesty note: the browsable card pages on the official site are a client-side app, and a plain request to a card URL returns a 404 for every set, BS7 and BS11 included. So the fact that a direct link to a BS12 card does not resolve tells you nothing about the set. The data feed is the source that works.

The set in one table

The last row is worth reading literally: no BS12 entry is flagged banned or limited in the database. That is the expected state for an unreleased set, not a statement about power level. The banned and restricted list is maintained separately and Devsisters has said it publishes changes when review warrants them rather than on a schedule.

How 112 cards become 148 entries

Braverse files alternate printings under the same base number with an @ suffix, so for any product with parallels the entry count runs ahead of the card count. Festival Arena is unusually tidy about it: every Rare, Super Rare and Ultra Rare gets exactly one Secret parallel, and no Common or Uncommon gets one.

That is 34 parallels. The remaining two entries are both Poison Mushroom Cookie, covered further down: an Extra Rare at BS12-111@2 and a Genesis Extra Rare at BS12-111@3. 112 + 34 + 2 = 148.

If you are collecting, the practical consequence is the same one that holds across the game: the highest treatment of a card is the same card number with the highest @ suffix, not a separate card. Our rarities and collecting guide covers the full ladder.

The six colour blocks

Card numbers run in strict colour order with no interleaving, which makes the set list easy to navigate once you know the boundaries.

Notice what is absent: there is no Pure block. Booster 11 [The Dark Enchantress War] included two Pure cards; Festival Arena includes none. Black does not swell to fill the space either — at 19 it ties Yellow, Green and Purple, where in BS11 it ran to 25 base cards.

Every colour gets the same skeleton, except Black

Break the 112 down by card type per colour and the design template is obvious. Each colour receives two FLIP cards, two Traps, two Items, one Stage and one EXTRA card. The only variable is the Cookie count — and Black.

Black trades two Cookies for two extra FLIP cards — four in one colour, where every other colour gets two. All four are Cake Hounds: Blueberry Cake Hound (BS12-095), Crimson Danger Cake Hound (BS12-096), Caramel Pudding Cake Hound (BS12-098) and Strategist Cake Hound (BS12-100).

The other thing Black does is lean on Booster 11. Ten of the 19 Black base cards reference Special Play in their rules text — the mechanic Devsisters introduced with the Black colour in The Dark Enchantress War. Red Velvet Cookie (BS12-112) carries the keyword itself; Poison Mushroom Cookie requires a Special Play Cookie already in your battle area to be playable at all. Whatever Black becomes, the database says it is being built on top of BS11 rather than beside it. Our Black cards guide covers the colour as it stands today.

Across the Cookies and EXTRA cards, the level spread is 33 at LV.1, 22 at LV.2 and 13 at LV.3 — 68 in total.

The six EXTRA cards

Festival Arena is the first Braverse set to give all six colours an EXTRA card. Here is every EXTRA card in the database by set, which is the enumeration that claim rests on:

All six BS12 EXTRA cards are Ultra Rares, and each has a Secret Ultra Rare parallel:

Each one gates itself behind an Arena-flavoured condition. Clotted Cream Cookie needs four or more Yellow Arena Cookies in your break area. Popping Candy Cookie needs an Arena Cookie to have been placed from your battle area onto the bottom of your deck that turn. Apple Faerie Cookie wants a Candy Apple Cookie with Arena on board, or seven or more Green cards in your support area. If you have been treating the break area as a resource, this set keeps doing that.

Heads up if you own our extra deck guide bookmark: that post counts 17 EXTRA cards, which was correct when it was written. Festival Arena adds six, taking the total to 23.

The second Genesis Extra Rare

Genesis Extra Rare is the top of the Braverse rarity ladder, and until August 31 it existed on exactly one card. Now there are two. Across all 2,243 entries in the English card database, these are the only rows carrying the GXR code:

Both are Black, and both follow the same four-step escalation off a single base number — UR, then SUR at @1, then EXR at @2, then GXR at @3. They differ on card type: Poison Mushroom Cookie is an EXTRA card, while Dark Enchantress Cookie at BS11-115 is filed as a plain Cookie. The EXTRA-type Dark Enchantress Cookie is a different card, BS11-116, and it has no GXR printing. Poison Mushroom Cookie is a Level 3 Black EXTRA Cookie with 5 HP, the skill MUSHY P., and an attack that reads: two Black energy, "Eat This Please", 2 damage, and then +1 HP if you started the game going second.

Its play condition has two clauses: four or more cards in your opponent's support area, and a Cookie with Special Play already in your battle area.

Two data notes for anyone counting rarities off the raw feed rather than a wiki. First, the SECRET RARE grade string appears in two forms in the BS12 rows — six entries carry a stray carriage return in front of it — so a naive group-by reports 6 and 6 rather than 12. Second, 12 rows in the database carry the EXR rarity code, but one of them (Timekeeper Cookie, BS6-031@2) has its grade filled in as ULTRA RARE. The feed is the best source available, and it still needs reading rather than trusting.

Why Arena is back

Every single one of the 148 entries in Festival Arena is tagged with the Arena keyword. That is not an inference from the data — Devsisters said it outright in the July 23 Community Letter, answering a reader question: yes, every card in Booster 12 will include the [Arena] keyword.

The keyword's history is short. Before BS12 it appeared on 162 entries in the whole database: all 136 filed under Booster 7 [Arena of Glory], 20 promotional cards, and six promo reprints of Arena of Glory cards filed under other products. Festival Arena's 148 entries roughly double that, to 310.

There is a seventh BS7 promo reprint that belongs in that count and is not in it. Cream Puff Cookie is filed under card number BS7_093@2 — one of five entries in the database whose number uses an underscore instead of a hyphen — and its keyword field reads Arema. It is the single misspelled keyword in the database, and it is the reason a careful count returns 162 rather than 163.

Both sets land on 76 base cards that name Arena in their rules text, off slightly different base counts. That is a coincidence worth flagging as one rather than reading as a design rule.

Devsisters gave the reasoning for the return in the same letter. Arena of Glory was built so that a player could open one booster box and build a working deck from it without owning much else, and the team considered that a good on-ramp for new players. Festival Arena is meant to do the same job, with two stated caveats: it is designed to combine naturally with Arena of Glory cards, and the team says it deliberately made the cards usable in decks that are not built around Arena at all, so they are not stranded outside the archetype.

Whether that lands is a question for October. If you want the current state of the older Arena set, our best Arena of Glory cards piece covers it.

Each colour's Stage card is named for a venue, which is about as on-theme as a set called Festival Arena could get: Crown Stage (Red), Well-Lit Workshop (Yellow), Orchestra Hall (Green), Comeback Stage (Blue), Summer Soda Festival (Purple) and Manager Scarlet's Coffee Truck (Black). Five of the six reference Arena Cookies directly in their text.

No new keywords

Here is a finding that cuts against the usual new-set narrative. Festival Arena uses nine bracketed keywords in its rules text:

Arena, Activate, Once Per Turn, Equip, EXTRA, Your Turn, On Play, Blocker, Special Play.

Every one of them already appears on a card printed before BS12. Checked against all 2,095 non-BS12 entries in the database, the set introduces zero new bracketed keywords.

That is consistent with what Devsisters described rather than a contradiction of it: the letter framed the coming sets as modifying and expanding existing mechanics as well as adding new ones, and framed BS12 specifically around bringing Arena back rather than around a new keyword. It also means you do not need to learn new vocabulary to read these cards. Our keywords explainer already covers all nine.

What ships after Festival Arena

Devsisters published the rest of the schedule in the same July letter. Dates after October are the publisher's stated targets, not confirmed release dates.

Timeline of Fate is described as a Blue deck built around Shadow Milk Cookie and the Time Balance Department. Legend of the Spirit Weapons is described as a martial-arts theme. Neither has a card list in the database yet, which is the same state Festival Arena was in a week ago.

For where these sets sit in the release order, see our set release timeline; for what a pre-release actually involves, the organized play guide has the event ladder.

Quick Action Checklist

• Pre-release is September 26; release is October 2, 2026. Devsisters has not published a Festival Arena pre-release notice yet; for the previous pre-release it pointed players at their local stores and at the event list on cookierun.topdeck.gg.
• The database's 148 rows are 112 numbers. The extra 36 are alternate printings of numbers you already counted — and the retail set is bigger than either figure, because Hidden cards never appear in the database.
• Commons and Uncommons have no Secret parallel. If you are chasing alt-arts, only the 34 Rare-and-up cards have one.
• Poison Mushroom Cookie (BS12-111) is the chase. It exists at four treatments off one number, ending in only the second GXR in the game.
• If you play Black, this set assumes you own Booster 11. Ten of its 19 Black cards reference Special Play.
• If you already play Arena of Glory, the pool roughly doubles. Devsisters says the two sets are designed to combine.
• Ignore anyone ranking these cards right now. Nobody has played the set. Check back after October.