MBC · Player guide
mystery booster commander release date
Mystery Booster Commander Edition debuted on through Festival in a Box at MagicCon Atlanta. [Source]
Its listed Commander legality date is . [Source]
Its listed all-format legality date is . [Source]
What each date means
Release access and play legality are separate milestones
2026-10-19 — Festival in a Box debut
This is the debut through Festival in a Box at MagicCon Atlanta. Sales are limited to in-person convention channels. [Source]
For players: this is the release-access milestone for that debut. Read it separately from the later legality dates.
Before this date: the stated debut had not yet taken place. [Source]
2026-11-13 — Commander legality
This is the listed date from which the set is usable in Commander. [Source]
For players: this is the relevant milestone when planning Commander use, subject to the restrictions below.
Before this date: the set's stated Commander legality milestone had not been reached. This page does not establish a card-by-card prohibition for earlier dates.
2027-01-01 — All-format legality date
This is the listed all-format legality date. [Source]
For players: check the intended card and format before using this date as permission to play it.
Before this date: this listed milestone had not been reached. The date alone does not establish an earlier ban for every card.
The 121 Playtest cards can be used only in this set's Draft and Sealed events. They are not legal in any Constructed format. [Release notes]
Availability
Sales channels: convention access, rather than regular retail
In-person convention channels only, rather than regular retail. [Source]
The release date should not be treated as a promise of availability at a regular retailer. If you cannot access the convention sales channel, direct access may be less convenient.
Check stock and purchase limits through the relevant sales channel.
Player questions
Frequently asked questions
What is the Mystery Booster Commander release date?
Mystery Booster Commander Edition debuted on 2026-10-19 through Festival in a Box at MagicCon Atlanta. [Source]
When is Mystery Booster Commander Edition legal to play?
The listed Commander legality date is 2026-11-13, and the listed all-format date is 2027-01-01. [Source] The 121 Playtest cards can be used only in this set's Draft and Sealed events. They are not legal in any Constructed format. [Release notes]