10 cards where the text includes “that much damage plus” and the color identity ≤ R and it’s legal in Commander

Akki Lavarunner // Tok-Tok, Volcano Born (Champions of Kamigawa #153)
Embermaw Hellion (Magic Origins #141)
Invasion of Regatha // Disciples of the Inferno (March of the Machine #148)
Invasion of Regatha // Disciples of the Inferno (March of the Machine #148)
Jaya, Venerated Firemage (War of the Spark #135)
Mechanized Warfare (The Brothers' War #139)
Pyromancer's Gauntlet (Magic 2014 #214)
Pyromancer's Swath (Modern Masters #125)
Sulfuric Vapors (Urza's Saga #220)
The Flame of Keld (Dominaria #123)
Torbran, Thane of Red Fell (Throne of Eldraine #147)

It is the moment of discovery, the triumph of the mind, and the end of these results.