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Brawl is very similar to Commander, with the following exceptions:

Players in multiplayer games start at 30 life, not 40.
Players in one-on-one start at 25 life, not 40.[6]
Players in one-on-one get one free Mulligan like in Multiplayer games.[6]
Decks consist of 60 cards, not 100.
Any Planeswalker can be a commander regardless of whether they have the ability to become a commander or not.
Only cards from Standard-legal sets can be used; consequently, Brawl uses its own banned and restricted list.
Commander damage rules (from Commander) do not apply.
You can use multiple copies of any one basic land in decks with a colorless commander.[7]

New promo cards system !
At the end of the event, three promo packs will be opened (one premium and two regular, total 12 promo cards). In final ranking order, players starting with the winner will pick a card and keep it. After last player picks a card, if there are card remaining, players pick again cards starting with the winner until there are no cards left