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

Audacious Swap (New Capenna Commander #44)
Chain of Plasma (Onslaught #193)
Chef's Kiss (Modern Horizons 2 #120)
Display of Power (The Lord of the Rings: Tales of Middle-earth #119)
Dual Strike (Kaldheim #132)
Expansion // Explosion (Ravnica Remastered #243)
Flare of Duplication (Modern Horizons 3 #119)
Fork (Masters Edition IV #116)
Fury Storm (Commander 2018 #22)
Galvanic Iteration (Outlaws of Thunder Junction Commander #227)
Geistblast (Shadows over Innistrad #160)
Increasing Vengeance (Commander 2019 #147)
Leap of Flame (Guildpact #121)
Odds // Ends (Dissension #153)
Pyromatics (Duel Decks: Izzet vs. Golgari #20)
Radiate (Torment #113)
Refuse // Cooperate (Commander 2019 #199)
Reiterate (Time Spiral Remastered #182)
Repeated Reverberation (Commander Masters #879)
Return the Favor (Outlaws of Thunder Junction #142)
Reverberate (Magic 2013 #145)
Scattershot (Scourge #102)
Storm King's Thunder (Commander Legends: Battle for Baldur's Gate #196)
Teach by Example (Strixhaven: School of Mages #241)
Twinferno (Dominaria United #149)
Wild Ricochet (Commander Legends #419)
Wyll's Reversal (Commander Legends: Battle for Baldur's Gate #209)

In the blink of an eye, they strode from deep snow to the end of this search.