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The short answer

Check the category before the date

New MBC cards #1–60: Commander from November 13, 2026; other Eternal formats from January 1, 2027, per the announced schedule checked October 21. Reprints retain existing legality. Acorn and playtest cards do not become constructed-legal on those dates.

What’s inside Mystery Booster Commander Edition? ↗

Start with the card category

Card categories and format permissions
CategoryConstructed playMBC Limited
New MBC cards, numbers 1–60Use the announced format dates. Not introduced to Standard, Pioneer, or Modern by this release.Use the event’s MBC card pool.
Existing reprintsKeep their existing format legality; a reprint does not erase bans.Available when included in your pool.
Playtest cardsNot legal in sanctioned constructed formats.Supported in the MBC Limited environment.
Acorn-stamped cardsNot legal in constructed formats.Supported in the MBC Limited environment.

For the Limited column, follow the MBC Draft deckbuilding rules.

How do I recognize the acorn mark?

Look at the bottom center, below the rules text. It is separate from the set symbol beside the type line.

Killer Cosplay from Unfinity, with an acorn stamp at the bottom center
Official enlarged acorn security stamp: an acorn outline, rather than an ovalAcorn shape

May be a printed symbol or a security stamp.

Killer Cosplay is an Unfinity reference example, not an MBC card. Official card image · Official symbol explanation. Images © Wizards of the Coast. Tap the card to enlarge.

For MBC, acorn cards are 0061–0070. They are not constructed-legal; the MBC Limited exception is separate. No acorn is not proof of legality: check playtest frames, the card’s format and bans too.

MBC product list and category rules

Are the Alchemy cards legal—including Tsagan?

Check the individual paper printing. Alchemy origins alone do not settle legality. The product article explicitly distinguishes Tsagan from the acorn-stamped cards.

Three paper cards with different permissions
ExampleWhat to identifyConstructed Commander
Tsagan, Raider WarlordMBC 0053; no acorn stamp.Part of the 1–60 group: use the announced November 13, 2026 entry date.
OvercookedMBC 0067; acorn symbol at the bottom.Not legal in constructed formats. The new-card date does not change that.
Common Black RemovalA playtest card in a playtest frame.Not legal in sanctioned constructed play; MBC Limited treats it separately.

References: Tsagan’s exception and format dates; Overcooked, playtest cards and Limited permissions.

Common questions

Does a Mystery Booster reprint make a card Modern-legal?

No. Inclusion in this product does not by itself introduce an existing card to a new constructed format.

Can I use a playtest card at my local Commander night?

Being at a store does not identify the format. It can be permitted in the MBC Limited card pool, while regular constructed Commander does not admit it by default. A casual table may agree to an exception; confirm that before the game.

Is a rule correction the same as a legality announcement?

No. For example, Tolabow’s corrected text explains how the card works; its format-entry date is a separate matter. Read the Tolabow guide.

The announced dates

New MBC cards · CommanderNovember 132026
New MBC cards · Other Eternal formatsJanuary 12027

These are format-entry dates, not a promise that every card is permitted in every event. Apply the relevant format’s banned list and event rules as well.

A practical way to check a card

  1. Identify the card. Search its exact name in Gatherer, the official card database. Check its set information and any playtest frame or acorn stamp.
  2. Name the format. “Commander at home” and “MBC Commander Draft” do not answer the same legality question.
  3. Check current official information. Use the updated product schedule for timing and the official banned and restricted lists for format restrictions.
  4. Separate house rules. A group may agree to a casual exception, but that agreement does not change official format legality.

If you are joining an organized event, settle an unclear card choice with the organizer before registering your deck.

Why the source date matters

The original release notes describe the eligible formats. The product article carries an editorial update with specific dates. This guide uses that updated schedule rather than assuming all named formats become legal at once.

A dated reference, not a live legality database.

Reviewed October 21, 2026. For a future event, follow the official links below and check for later announcements.

Official sources & review notes

Checked October 21, 2026. Follow the original publications for later updates.

What’s inside Mystery Booster Commander Edition?Updated product article · Wizards of the CoastProduct contents and the updated, format-specific legality dates.Mystery Booster Commander Edition release notesAugust 3, 2026 · Wizards of the CoastCommander Draft, partner, Rulebreaker, and card-specific rulings.Acorn stamp: official visual referenceUnfinity mechanics · September 20, 2022 · Wizards of the CoastOfficial close-up of the symbol. MBC permissions are covered by the MBC sources below.Acorn stamp on a printed cardUnfinity product guide · September 20, 2022 · Wizards of the CoastKiller Cosplay illustrates the bottom-center position; it is not shown as an MBC card.Commander format overviewOfficial format reference · Wizards of the CoastOrdinary Commander deck construction, life totals, and the command zone.