Brawl is a 60 card Commander using only cards from standard so rules for creating your deck would be
- 1 Legendary creature or planeswalker that allows using it as a commander.
- 59 other cards with no more than 1 of each card except for basic lands, each of these cards must have same color identity as your commander.
- All cards in your deck must be standard legal
When you have more than 2 players each player starts with life total of 30, if only 2 players then 25 is your starting life total.
First mulligan is to 7 cards
If your commander dies or is exiled you can set it to commander zone, each time you play it after first it costs 2 colorless mana more/times it has died.
https://magic.wizards.com/en/game-info/gameplay/formats/brawl
What would be your favorite Brawl commander from the current standard cards?
