26 cards where the colors ≥ R and the full Oracle text includes “copy” and the card types include “instant”

Reverberate (Magic 2013 #145)
Increasing Vengeance (Commander 2019 #147)
Reiterate (Time Spiral Remastered #182)
Twinferno (Dominaria United #149)
Expansion // Explosion (Ravnica Remastered #243)
Wyll's Reversal (Commander Legends: Battle for Baldur's Gate #209)
Wild Ricochet (Commander Legends #419)
Galvanic Iteration (Outlaws of Thunder Junction Commander #227)
Storm King's Thunder (Commander Legends: Battle for Baldur's Gate #196)
Chef's Kiss (Modern Horizons 2 #120)
Fury Storm (Commander 2018 #22)
Repeated Reverberation (Commander Masters #879)
Display of Power (The Lord of the Rings: Tales of Middle-earth #119)
Teach by Example (Strixhaven: School of Mages #241)
Fork (Masters Edition IV #116)
Dual Strike (Kaldheim #132)
Return the Favor (Outlaws of Thunder Junction #142)
Audacious Swap (New Capenna Commander #44)
Radiate (Torment #113)
Refuse // Cooperate (Commander 2019 #199)
Scattershot (Scourge #102)
Chain of Plasma (Onslaught #193)
Pyromatics (Duel Decks: Izzet vs. Golgari #20)
Geistblast (Shadows over Innistrad #160)
Odds // Ends (Dissension #153)
Leap of Flame (Guildpact #121)

This search is finished. Now the real work can begin.