19 cards where the color identity ≤ R and (the full Oracle text includes “whenever you discard” or the full Oracle text includes “whenever you draw”)

Psychosis Crawler (Murders at Karlov Manor Commander #234)
Containment Construct (Kamigawa: Neon Dynasty #243)
Glint-Horn Buccaneer (Core Set 2020 #141)
Bag of Holding (Commander Legends: Battle for Baldur's Gate #299)
Surly Badgersaur (Commander 2020 #57)
Currency Converter (New Capenna Commander #81)
Conspiracy Theorist (Strixhaven: School of Mages #94)
Brallin, Skyshark Rider (Commander 2020 #4)
Invasion of Kaldheim // Pyre of the World Tree (March of the Machine #145)
Invasion of Kaldheim // Pyre of the World Tree (March of the Machine #145)
Inti, Seneschal of the Sun (The Lost Caverns of Ixalan #156)
Irencrag Pyromancer (Throne of Eldraine #128)
Mishra, Excavation Prodigy (The Brothers' War #140)
Diviner's Wand (Morningtide #142)
Mad Ratter (Throne of Eldraine #130)
Veronica, Dissident Scribe (Fallout #70)
Moonring Mirror (Champions of Kamigawa #262)
Pitchstone Wall (Torment #110)
Bloodhaze Wolverine (Throne of Eldraine #113)
A-Mishra, Excavation Prodigy (The Brothers' War #A-140)

The arc of my blade has carved a path of light to the end of these results.