37 cards where the cards can be your commander and the color identity is BGR

Adun Oakenshield (Masters Edition #141)
A-Mr. Orfeo, the Boulder (Streets of New Capenna #A-204)
A-Soul of Windgrace (Dominaria United #A-220)
Bartel Runeaxe (Masters Edition III #145)
Bhaal, Lord of Murder (Commander Legends: Battle for Baldur's Gate #268)
Coram, the Undertaker (Modern Horizons 3 Commander #7)
Darigaaz Reincarnated (Dominaria #193)
Darigaaz, Shivan Champion (Alchemy: Dominaria #22)
Darigaaz, the Igniter (Duel Decks: Phyrexia vs. the Coalition #47)
Disa the Restless (Modern Horizons 3 Commander #1)
Gyrus, Waker of Corpses (Commander 2018 #41)
Henzie "Toolbox" Torre (New Capenna Commander #2)
Indoraptor, the Perfect Hybrid (Jurassic World Collection #15)
Karrthus, Tyrant of Jund (Double Masters #205)
Korvold, Fae-Cursed King (Throne of Eldraine #329)
Korvold, Gleeful Glutton (Wilds of Eldraine Commander #26)
Kresh the Bloodbraided (New Capenna Commander #345)
Lord Windgrace (Commander 2018 #43)
Maarika, Brutal Gladiator (Universes Within #15)
Mr. Orfeo, the Boulder (Streets of New Capenna #204)
Ognis, the Dragon's Lash (Streets of New Capenna #210)
Prossh, Skyraider of Kher (Masters 25 #214)
Sek'Kuar, Deathkeeper (Commander Masters #354)
Shattergang Brothers (Double Masters 2022 #275)
Slimefoot and Squee (March of the Machine Commander #447)
Soul of Windgrace (Dominaria United #220)
Thantis, the Warweaver (Commander 2018 #46)
The Beamtown Bullies (New Capenna Commander #6)
Vaevictis Asmadi (Masters Edition III #185)
Vaevictis Asmadi, the Dire (Core Set 2019 #225)
Vazi, Keen Negotiator (New Capenna Commander #92)
Wasitora, Nekoru Queen (Double Masters 2022 #293)
Winter, Misanthropic Guide (Duskmourn: House of Horror #240)
Xira Arien (Dominaria Remastered #205)
Xira, the Golden Sting (Dominaria United Commander #48)
Yurlok of Scorch Thrash (Commander Legends #293)
Ziatora, the Incinerator (Streets of New Capenna #231)

Though this query has ended, its relics still slumber in New Argive.