Last verified: October 20, 2026 · Card text via Scryfall
Rulebreaker is the new ability word that makes Mystery Booster Commander Edition historically weird: eight cards whose abilities change Commander’s deck-construction rules before the game begins. A brand-new comprehensive rule — 903.5e, added by the October 19, 2026 Update Bulletin — makes those abilities function at deck-check time, so what they grant is law, not house ruling. Here is every Rulebreaker card with its full text and what it actually opens up.
Every Rulebreaker ability is a deck-construction permission, not an in-game effect. Rule 903.5e says these abilities function before the game begins if the card with the Rulebreaker ability is your commander — which is the only moment deck legality is judged. The mechanic was designed with input from the Commander Format Panel, and each permission is strictly scoped: color identity exceptions, land exceptions, deck-size exceptions. Your 100-card count, your singleton rule, and Commander’s ban list are all untouched unless a card’s text says otherwise.
In Commander draft — the product’s intended format — the usual comfort rules apply too: Partner returns, and any commander of one color or fewer without Partner is treated as having Partner, so the monocolored Rulebreakers slot cleanly into a draft pool built around them.
Rulebreaker — A deck with this commander can have Angel cards of any color identity and any basic land cards.
Flying
Whenever Seluma deals combat damage to a player, return target Angel creature card from your graveyard to the battlefield.
White gets an Angel tribal commander that ignores color identity entirely — Kaalia-grade Angels like Avacyn, Angel of Hope sit alongside Iona-style haymakers from every color, with recursion attached to combat damage.
Rulebreaker — If Tolabow, Loch Rascal is your commander, the color identity of instant and sorcery cards in your deck can include one color of your choice not in your commander's color identity, and your deck can have any basic land cards.
Whenever you cast an instant or sorcery spell, create a 1/1 blue and red Otter creature token with prowess.
The narrowest but most explosive permission: your instants and sorceries may borrow exactly one off-color. Blue commanders pick red for dual-cast prowess tokens or green for Cyclonic Rift-adjacent value. This card also received an Oracle text update in the October 19, 2026 bulletin, rewording its Rulebreaker ability for clarity.
Rulebreaker — A deck with this commander can have Phyrexian cards of any color identity and any basic land cards.
Phyrexian creatures you control have menace and lifelink.
The first rule that keys on a card's faction rather than its color: every card with the Phyrexian type — across all five colors and every era of the game's history — is legal here, and they all get menace and lifelink.
Rulebreaker — A deck with this commander can have Aura cards of any color identity and any basic land cards.
+1: Add one mana of any color. When you spend this mana to cast an Aura spell this turn, create a 1/1 red Gremlin creature token.
−3: Discard your hand, then draw cards equal to twice the number of Auras you control. For each Aura attached to you, attach it to an opponent of your choice.
The set's own cursed mascot: an Aura-matters commander whose ultimate weaponizes the Auras stuck to you by handing them to opponents. Note it is a planeswalker, one of the seven new subtypes' holders.
Rulebreaker — A deck with this commander can have creature cards with mana value 7 or greater of any color identity and any basic land cards.
Whenever a creature you control with mana value 7 or greater attacks, double its power and toughness until end of turn.
Any creature seven or greater, any color — meaning ETB titans, Eldrazi, and every dramatic entrance in the game's history, all of them attacking with doubled power.
Rulebreaker — A deck with this commander can have artifact creature and Equipment cards of any color identity and any basic land cards.
Whenever you cast an artifact creature or Equipment spell, you may copy that spell. Do this only once each turn. (The copy becomes a token.)
Colorless gets in on the breaking: artifact creatures and Equipment of any identity, with a built-in once-per-turn duplicate of everything you forge.
Rulebreaker — A deck with this commander has no maximum deck size.
{3}, {T}: You draw a card and gain 1 life. This ability costs {3} less to activate if you had 200 or more cards in your starting deck.
Battlecruiser Magic, formalized: no 100-card cap, and the tap ability gets cheap once your starting deck crosses 200 cards. The bulletin's rules for deck checks treat this as a construction-time property.
Rulebreaker — A deck with this commander can have any land cards.
Whenever Grizzlegom attacks, create a 1/1 white Soldier creature token for each Plains you control. Draw a card for each Island you control. Each opponent loses 1 life for each Swamp you control. Put a +1/+1 counter on Grizzlegom for each Mountain you control. You gain 1 life for each Forest you control.
Five-color basics, no nonbasic restrictions: every basic land type at once, so each attack triggers five separate rewards at scale. Land destruction and utility lands from every color come along for the ride.
The five monocolored commanders are the easiest entry points because each one’s permission implies its deck. Seluma wants every great Angel ever printed; Maular wants a curve that starts at seven; Valko wants three decades of Phyrexians; The Unluckiest Planeswalker wants a pile of Auras you are willing to donate; Tolabow wants exactly one off-color identity for its instants and sorceries. The Everforger and Grizzlegom scale with the table — one doubles your artifacts, the other pays you for every basic land type you run.
For context on the rest of the set — including the seven new planeswalker subtypes that several of these commanders belong to — see the main game changes page and the full 80-card list. If you are still deciding whether the product is worth chasing at all, the how-to-get guide covers prices and availability.
Eight. Five are monocolored commanders (Seluma in white, Tolabow in blue, Valko Indorian in black, The Unluckiest Planeswalker in red, Maular in green), The Everforger is the colorless one, and Whtz, the Bibliophile and Grizzlegom, Hurloon Hero round out the list.
No. Each Rulebreaker ability is written relative to being your commander, so in other formats the ability simply never applies — the cards are ordinary (if overstatted) legendaries there.
By default, yes — Commander's other construction rules are unchanged. Only the specific rule a card breaks is broken. Whtz is the exception that removes the maximum deck size entirely; Grizzlegom and friends still require a 100-card list that is otherwise legal.
Only as far as each card's text allows. Seluma permits Angel cards of any identity, not every card; Tolabow permits exactly one extra color for instants and sorceries; Grizzlegom permits any lands but says nothing about spells.