Core rules

The complete rules of Cali Commander as of Beta v0.1, stated once, with the undecided parts labeled undecided instead of "coming in the tournament packet."

Deck construction

• Normal Commander deck construction unless stated otherwise.
• 100 cards total, including the commander or commanders.
• Singleton, except basic lands and cards that specifically say otherwise.
• Color identity rules apply.
• Partner and other official commander-pairing mechanics are legal unless a specific commander is banned.

Gameplay

• 1v1.
• Players start at 30 life. (Set by a 58-voter poll; the rerun with verified accounts is open now.)
• The player who takes the first turn does not draw on their first draw step.
• 21 commander damage applies. Note that it was calibrated for 40-life multiplayer and has not been recalibrated for 30.
• The banlist applies. The watch list does not; watched cards are legal.

Openly undecided

These are real questions the format has not answered. Listing them beats pretending they are settled:

• Best-of-one or best-of-three for tournaments. The Denver event's structure publishes with its full details on the events page.
• Whether 21 commander damage is the right number at 30 life.
• Whether combo is too protected at 30 life.
• Mulligan rules for competitive play.
• Sideboards, if best-of-three.

When these get answered, the answers appear here, in the change log, and in an announcement, all on the same day.