Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $0.49 at Card Kingdom, near mint, their price list as of .
Barroom Brawl 
Sorcery · Rare · Commander Legends: Battle for Baldur's Gate · #217
Target creature you control fights target creature the opponent to your left controls. Then that player may copy this spell and may choose new targets for the copy.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends: Battle for Baldur's Gate | 217 | Rare | $0.49 | $0.49 |
| Commander Legends: Battle for Baldur's Gate | 587 | Rare | $0.59 | $0.49 |
| Battle for Baldur's Gate Promos | 217s | Rare | — | $0.99 |
6 rulings from Wizards of the Coast
- 10 June 2022Each copy of Barroom Brawl also includes the opportunity to create a copy, so as long as there are legal targets available and the copies keep successfully resolving, the brawl can continue.
- 10 June 2022If the opponent to your left chooses to copy Barroom Brawl but not change its targets, both targets will probably be illegal as the copy tries to resolve (at a minimum, both targets would have to survive and switch controllers in response to still be legal targets for the copy), and the player to their left will not be able to copy it.
- 10 June 2022If both targets are illegal as Barroom Brawl attempts to resolve, it does nothing. No copy will be created.
- 10 June 2022In a two-player game, the other player is the opponent to your left.
- 10 June 2022The opponent to your left may choose the creature they control that was part of the original fight as the first target for their copy, even if it would die after the original spell is done resolving. If it does die, however, it will be an illegal target as the copy tries to resolve.
- 10 June 2022If one target is legal and the other is not legal as Barroom Brawl resolves, neither creature will deal damage. However, the opponent to your left may still choose to copy Barroom Brawl.