Union Arena Purple Todo Deck Guide: JJK Regional Winner

How we checked this: we pulled the winning list from Bandai's top-placing archive through its Bandai TCG+ deck code, compared it with a later local winner, read every card on Bandai's official card list, priced both on TCGplayer on October 16, 2026, and worked out the draw odds with a script.

Updated October 16, 2026: The archive's deck code shows the full winning list, so we replaced "the leader isn't identified" with the actual 50 cards, added prices and odds, and fixed the 080 Todo's cost (it sidelines a card from your hand; it doesn't trash one).

The Union Arena Purple Todo deck list

Bandai's archive lists a Purple Jujutsu Kaisen deck in first place at Core TCG's Wave 1 regional, dated July 31. Open the deck code and it's a Todo list: 15 Aoi Todo across four printings, all Kyoto Jujutsu High. brad_m won a Timemasters weekly on August 24 with nearly the same 50; the lists share 47 cards.

Cards without a set code are from UE03BT. brad_m trims a Goodwill Event and an 080 Todo for a second Kokichi Muta (JJK-3-030) and a Kasumi Miwa (084). The core is identical.

How the deck wins

Damage 2 is the closer. Aoi Todo (081) has it printed: when he attacks and deals direct damage, he deals 2 instead of 1. Aoi Todo (080) gets it until the end of the turn by placing a card from your hand into your sideline, once per turn.

Image: Bandai, UNION ARENA official card list

The swap is the disruption. When Played, Aoi Todo (081) gains 2000 BP until the end of the turn and may swap one character on your opponent's front line with one on their energy line. Pull a big blocker back and push a small energy character forward, then swing for two. Boogie Woogie does the cheaper version: it puts a front-line character with 5000 or less BP on the bottom of the deck, gives your opponent a small replacement whose When Played doesn't trigger, and draws you a card if a Todo is on your field.

Ultimate Mechamaru, Mode: Absolute is the reason the deck got better in the second set. When Played, he sidelines a front-line character with 3500 or less BP or sidelines a site. With five other Kyoto Jujutsu High cards or a Kasumi Miwa on your field, he gains Impact 1. JWA pointed at that site removal as Todo's answer to Blue Sukuna's Shrine.

Image: Bandai, UNION ARENA official card list

Everything else feeds those three. Utahime Iori digs three deep for a Kyoto Jujutsu High card. Kokichi Muta counts as an Ultimate Mechamaru, so he's a Raid target for Mode: Absolute. Domain Expansion stands up two AP for a big turn, and Goodwill Event pulls a Kyoto Jujutsu High character back from your sideline and plays it.

What the odds say

You'll almost always have a Todo. You'll have the one you want a bit more than half the time by your third or fourth turn, which is why the deck runs so many ways to dig and to recur from the sideline.

Where Purple Todo stands now

The regional win holds up, and nothing has added to it. Core TCG's top four was Todo, Red Rurouni Kenshin, Green Bleach and Yellow Sakamoto Days. Since then Bandai's archive shows no Jujutsu Kaisen deck in any regional top four, and UnionArenaDecklists' tier board, built from top eights between August 28 and October 12, has no Jujutsu Kaisen character on it.

Locals are kinder. UnionArenaDecklists hosts 116 public Todo lists, newest October 7, with brad_m's win, a fourth place at The TCG Dojo on September 11 and a third at a UA weekly on September 17.

JWA ranked Purple Todo third of eight Jujutsu Kaisen decks after the second set, behind Blue Sukuna and Nanami/Sukuna, and called it "a deck with something of a cult following." His reason for the bump: "the primary technical advantage here still rests in Todo's character swapping ability – the best of its kind in the game."

WabbleTCG sat down with Grrrmo, who won "the recent Union Arena Regional in Pomona CA" with Todo, to talk through the deck. Core TCG, the store behind that regional, runs its offline regionals in Pomona.

Our take

Build the Core TCG list as it is. It's cheap apart from three cards, the swap and Boogie Woogie make games feel interactive, and it still wins weeklies. Just be honest about where it sits: two months without a regional top four is a real signal, and Purple Solo Leveling is the deck it has to beat.

Frequently Asked Questions

Is Purple Todo a good deck in Union Arena? Yes for locals. It won the Core TCG regional dated July 31, 2026, and still places at weeklies, but no Jujutsu Kaisen deck has made a regional top four since.

What is the key card in the Purple Todo deck? Aoi Todo (UE03BT/JJK-1-081): 5 energy, 4000+ BP, Damage 2, and a When Played swap of your opponent's front-line and energy-line characters.

What does Damage 2 do in Union Arena? When the character attacks and deals direct damage, it deals 2 instead of 1. The 080 Todo gains it by sidelining a card from your hand.

How much does the Purple Todo deck cost? The Core TCG list cost $62.88 on October 16, 2026, mostly in the 081 Todo, the JJK-2-010 Todo and Mode: Absolute.

How is Purple Todo different from other Jujutsu Kaisen decks? It's a Kyoto Jujutsu High deck. Every character shares that affinity, which turns on Mechamaru's Impact and Kokichi Muta's BP cut.

Related Reading

• Union Arena JJK Guide: Jujutsu Kaisen Best Decks: the other Jujutsu Kaisen builds.
• Union Arena Current Meta: official regional results across every set.
• Union Arena Raid Mechanic Explained: how Todo and Mode: Absolute Raid.
• Union Arena Trigger System Explained: the Color and Active triggers this list runs.