Rulebreaker is Mystery Booster Commander Edition's headline new mechanic: an ability word that lets a specific card, when designated as your commander, bend one of Commander's normal deckbuilding rules. It's the kind of design space Wizards has explicitly said is reserved for a set like this — a Commander Draft product built to be wild and chaotic rather than tightly balanced for standard constructed play.
Several commanders confirmed to carry the ability word include Seluma, Light of Aysen; Tolabow, Loch Rascal; Valko Indorian; The Unluckiest Planeswalker; Maular, the Next Evolution; Whtz, the Bibliophile; and The Everforger. Each one bends a different specific rule, from color identity restrictions to deck size itself.
This guide breaks down exactly how Rulebreaker works and walks through what each confirmed card actually does.
Because this is a genuinely new mechanic, understanding the ground rules matters before drafting or building around any Rulebreaker commander.
A card's Rulebreaker ability only applies if that card is designated as your deck's actual commander, and it only functions before the game begins, during deckbuilding. Rulebreaker abilities don't override every deckbuilding restriction — only the ones they specifically mention, so the singleton rule and the 100-card deck size requirement still apply unless a specific card's text says otherwise.
That means a Rulebreaker commander bending color identity rules still respects every other standard Commander deckbuilding restriction unless its own text says otherwise. Reading each card's exact wording carefully matters more here than with almost any other commander ability, since the scope of what's actually changed varies card to card.
A deck with Seluma as its commander can include Angel cards of any color identity, plus any basic land cards, regardless of Seluma's own color identity.
Her other ability lets her return an Angel creature card from your graveyard to the battlefield whenever she deals combat damage to a player, making her a genuine Angel tribal payoff on top of the deckbuilding flexibility.
Tolabow lets a deck's instant and sorcery color identity expand by one color of your choice beyond the commander's own color identity, plus any basic lands.
Confirmed via Wizards' own Oracle text update, this specifically only expands instant and sorcery color identity, not the deck's overall color identity for other card types.
A deck with Valko as its commander can include Phyrexian-type cards of any color identity, plus any basic lands, letting a Phyrexian tribal deck pull from across all five colors. Wizards clarified this refers specifically to the Phyrexian creature type, not cards with Phyrexian mana symbols or Phyrexian-language text printed on them.
The Phyrexian creature type itself was only formally introduced in 2021, with many older cards updated via Oracle text to carry it retroactively. That update history is worth knowing before assuming a specific old card qualifies for Valko's ability without checking its current Oracle text.
This commander allows a deck to include Aura cards of any color identity, plus any basic lands, giving Auras decks a genuinely unrestricted color palette to draw from.
As a planeswalker, it's also confirmed to be legal as a commander in its own right, not just a 99-card inclusion, which is notable given how few planeswalkers can serve as commanders under the format's normal rules.
Maular allows a deck to include creature cards with mana value 7 or greater of any color identity, plus any basic lands, rewarding a big-creature strategy across all five colors. Whtz, the Bibliophile removes a deck's maximum deck size entirely, and The Everforger allows artifact creature and Equipment cards of any color identity plus any basic lands — three genuinely distinct rule-bending effects rounding out the confirmed list.
Whtz's ability is the most extreme of the seven, since removing a deck-size cap entirely opens the door to decks running hundreds of cards rather than the usual fixed 100. Maular and The Everforger, by contrast, keep the standard deck size but open up the color-identity restriction for a specific card category, following the same general pattern as Seluma and Valko.
A reliable supply of EVORETRO Matte Card Sleeves keeps every card protected from ordinary wear and tear.
It lets a specific commander bend one particular deckbuilding rule, like color identity restrictions.
No, it only affects the specific restrictions each card's text mentions.
Yes, a deck with Whtz as commander has no maximum deck size.
At least seven are confirmed by name through Wizards' own release notes.
Rulebreaker gives Mystery Booster Commander Edition its most genuinely novel design space, letting a handful of commanders bend rules that have defined Commander deckbuilding for years. Once you've settled on a Rulebreaker commander, a binder with room for the unusual color spread it enables keeps everything organized, like the EVORETRO Regular Card Binder.
!
