TLDR: The MTG Arena Brawl Nadu ban Competitive Brawl question has a less dramatic answer than the announcement may initially suggest. Nadu, Winged Wisdom is scheduled to be banned in regular Brawl on September 22, 2026, but it is already banned in Competitive Brawl. The update closes a legality gap; it does not create a new refuge for Nadu decks. The larger lesson is still important: Brawl and Competitive Brawl are separate deck destinations with different banned lists, matchmaking systems, and mulligan rules.
Wizards announced the regular Brawl ban on September 11 as part of a larger Arena update that also schedules more than 200 rebalanced tabletop cards to return to their printed versions on September 22. That announcement explicitly says Competitive Brawl receives no changes in this update. Read Wizards’ State of the Formats announcement
That “no changes” line is easy to misread. It does not mean Nadu remains legal in Competitive Brawl. It means Competitive Brawl does not need another Nadu change because the card is already on that format’s banned list. Wizards included Nadu on the initial Competitive Brawl banned list, and the current official Banned & Restricted page continues to list it there.
The Nadu legality answer, queue by queue
| Arena queue | Nadu status | What the September 11 announcement changes |
|---|---|---|
| Brawl | Scheduled to be banned effective September 22, 2026 | Adds Nadu to the regular Brawl banned list |
| Competitive Brawl | Already banned | Nothing; Wizards announced no Competitive Brawl changes |
After the scheduled September 22 update takes effect, a deck containing Nadu should not be legal in either Arena singleton queue. A regular Brawl Nadu deck therefore cannot escape the new restriction by moving into Competitive Brawl. Removing Nadu is required either way, and replacing the commander may demand more than a one-card substitution if the deck was built around targeting creatures and generating repeated triggers.
This distinction matters because ban announcements are scoped to formats, not to every queue that happens to resemble that format. “Competitive Brawl has no changes” reports what happened to its list in this particular update. It does not restate every card already prohibited there. For a legality decision, the current format list controls—not an inference drawn from which names appear in the newest announcement.
Competitive Brawl is not merely Brawl with a rank attached
Both queues use a broadly similar foundation: 100-card singleton decks organized around a commander and color identity, played one-on-one with 25 starting life. Regular Brawl is best-of-one and provides a free mulligan. Those similarities make deck portability look simpler than it is.
Wizards introduced Competitive Brawl as a separate competitive format with its own ban-list philosophy and play structure. It uses Constructed rank and rating for matchmaking, does not account for deck composition when matching players, and removes regular Brawl’s free mulligan. That is a real strategic package, not a cosmetic queue label.
| Deckbuilding question | Regular Brawl | Competitive Brawl |
|---|---|---|
| How are matches formed? | Wizards says deck composition factors into matchmaking | Constructed rank and rating are used; deck composition is not factored in |
| Is there a free mulligan? | Yes | No |
| How is the banned list framed? | More aggressive curation can include cards used in the 99 | A lighter approach to noncommander bans, with more focus on problematic commanders |
| What should you verify? | Current Brawl legality for the commander and all 99 cards | Current Competitive Brawl legality for the commander and all 99 cards |
The mulligan difference alone can change deck construction. A free mulligan gives regular Brawl decks more latitude to send back a weak opener without immediately losing a card. Competitive Brawl removes that protection, increasing the cost of unreliable mana, narrow opening hands, and expensive cards that do nothing early. That does not produce one mandatory land count, but it should push builders to examine opening-hand quality rather than assuming a list will behave identically in both queues.
Matchmaking also changes what queue selection means. Regular Brawl’s deck-composition matchmaking and Competitive Brawl’s rank-and-rating system are different methods of choosing opponents. Neither fact, by itself, proves that one queue has a particular metagame, match length, or universally higher deck quality. It does mean that changing queues changes the environment responsible for pairing your deck.
The 99 can become illegal even when the commander is fine
Nadu attracts attention because it can lead a deck, but queue-specific legality is not only a commander check. Wizards says regular Brawl is being curated more aggressively around cards appearing in the 99, while Competitive Brawl is intended to use a lighter list for noncommander cards and focus more heavily on problematic commanders.
The official lists illustrate the difference. Ancient Tomb, Chrome Mox, Mana Drain, Force of Will, Subtlety, Strip Mine, Time Warp, and Wash Away are listed as banned in Brawl but are absent from the supplied Competitive Brawl banned list. Their absence does not establish that they are common, optimal, or appropriate for every deck. It establishes only the legality distinction: a card rejected by regular Brawl is not automatically rejected by Competitive Brawl.
There is overlap as well. The current official lists include Nadu, Lutri, Oko, Ragavan, Rusko, Old Stickfingers, Tamiyo, and Wrenn and Six among cards banned in both formats. The categories are therefore neither identical nor opposites. A builder cannot safely remember one list and mentally invert it to obtain the other.
This is especially relevant when importing, copying, or revisiting an older list. A deck can have a legal commander and still fail because one card in the 99 belongs to the wrong queue’s banned list. Conversely, removing a card merely because it is banned in the other Brawl format can weaken the list unnecessarily. Check the destination first, then edit against that destination’s actual restrictions.
What Nadu builders should change
If Nadu is the commander, the September 22 regular Brawl change removes the deck’s organizing card rather than one interchangeable value piece. The responsible rebuild starts by identifying what the list expected Nadu to supply: access to a Simic commander, rewards for targeting creatures, extra cards or lands, and a reason to include repeated targeting effects. A replacement commander that shares only the colors may leave many support cards stranded.
Sort the old deck into functional groups before spending resources on replacements:
- Independent mana, interaction, and broadly useful threats that remain effective without Nadu.
- Targeting effects that are acceptable cards on their own but became substantially better with Nadu.
- Narrow enablers included mainly to trigger Nadu repeatedly.
- Payoffs or finishers that still work if the commander and engine change.
- Cards whose legality must be checked separately for the intended queue.
Keep the first group unless the new commander creates a reason to change it. Reassess the second group card by card. The narrow enablers are the most likely cuts because preserving them without their central payoff creates the classic Commander problem of drawing half an engine. The replacement should be a coherent deck, not a Nadu list with a different legendary creature taped over the command zone.
This is also a good moment to remember that Arena Brawl retains a digital-only identity rather than functioning as paper Commander inside the client. Players moving between the two contexts should account for Arena-specific cards and rebalanced versions as well as queue-specific bans. Our explanation of Arena Brawl’s continuing digital-only card pool covers that broader distinction.
Choose the queue before committing to the deck
The safest workflow is to treat the queue as a deckbuilding constraint, alongside color identity and singleton construction. Do not build a generic “Arena Brawl deck” and decide where it belongs afterward.
- Choose regular Brawl or Competitive Brawl as the intended destination.
- Check the commander against that queue’s current official banned list.
- Check every card in the 99; do not stop after confirming the commander.
- Confirm whether Arena is using a printed or rebalanced version of each important card after the September 22 update.
- Build opening hands for the correct mulligan rule. Competitive Brawl does not grant regular Brawl’s free mulligan.
- Evaluate the list under the destination’s matchmaking assumptions rather than treating the queues as interchangeable.
- Before spending wildcards, recheck any legality change with a future effective date in the live client and official list.
For Competitive Brawl, pay extra attention to early mana and functional opening hands. Count how many openers can cast relevant spells on time without relying on a free first mulligan. For regular Brawl, do not interpret deck-composition matchmaking as permission to ignore efficiency or interaction; it is a pairing mechanism, not a guarantee that every match will conform to a preferred power band.
If maintaining versions for both queues, duplicate the list and label each copy clearly. Then track three categories: cards legal in both, cards legal only in the chosen queue, and cards whose versions or legality changed with an Arena update. That small administrative step is less exciting than brewing, but it prevents spending time tuning a list for a queue that will reject it.
The ban closes a gap, but the format distinction remains
The sharpest reading of the September announcement is not that Competitive Brawl somehow dodged a Nadu ban. Competitive Brawl already had one. Regular Brawl is scheduled to join it on September 22, closing the difference for this particular card while other legality differences remain.
Choose the queue first, verify both the commander and the 99, and tune the mana and opening hands for the correct mulligan system. Nadu is the headline, but the durable deckbuilding rule is broader: similarly named singleton formats are not interchangeable once their banned lists and play structures start making different demands.