43 cards where the card types include “demon” and the cards are multicolored and the cards aren’t reprints

Rakdos, the Muscle (Outlaws of Thunder Junction #226)
Rakdos, Patron of Chaos (Murders at Karlov Manor #224)
Vito, Fanatic of Aclazotz (The Lost Caverns of Ixalan #243)
The Beast, Deathless Prince (Doctor Who #114)
The Balrog of Moria (Tales of Middle-earth Commander #46)
The Balrog, Flame of Udûn (The Lord of the Rings: Tales of Middle-earth #297)
Shelob, Child of Ungoliant (The Lord of the Rings: Tales of Middle-earth #230)
The Balrog, Durin's Bane (The Lord of the Rings: Tales of Middle-earth #195)
Ob Nixilis, Captive Kingpin (March of the Machine: The Aftermath #41)
Hidetsugu and Kairi (March of the Machine #228)
Pink Horror (Warhammer 40,000 Commander #136)
Magnus the Red (Warhammer 40,000 Commander #131)
Exalted Flamer of Tzeentch (Warhammer 40,000 Commander #119)
Chaos Defiler (Warhammer 40,000 Commander #110)
Be'lakor, the Dark Master (Warhammer 40,000 Commander #6)
Sol'Kanar the Tainted (Dominaria United #219)
Orca, Siege Demon (Dominaria United Commander #37)
Ziatora, the Incinerator (Streets of New Capenna #231)
Raffine, Scheming Seer (Streets of New Capenna #213)
Lord Xander, the Collector (Streets of New Capenna #197)
Jetmir, Nexus of Revels (Streets of New Capenna #193)
Falco Spara, Pactweaver (Streets of New Capenna #186)
Orcus, Prince of Undeath (Adventures in the Forgotten Realms #229)
Daemogoth Woe-Eater (Strixhaven: School of Mages #175)
Daemogoth Titan (Strixhaven: School of Mages #174)
Kardur, Doomscourge (Kaldheim #216)
Gyruda, Doom of Depths (Ikoria: Lair of Behemoths #221)
Rakdos, the Showstopper (Ravnica Allegiance #199)
Rafter Demon (Ravnica Allegiance #196)
Rakshasa Vizier (Khans of Tarkir #193)
Rakshasa Deathdealer (Khans of Tarkir #192)
Butcher of the Horde (Khans of Tarkir #168)
Sire of Insanity (Dragon's Maze #104)
Master of Cruelties (Dragon's Maze #82)
Rakdos, Lord of Riots (Return to Ravnica #187)
Silent-Blade Oni (Planechase 2012 #105)
Defiler of Souls (Alara Reborn #37)
Illusory Demon (Alara Reborn #21)
Malfegor (Conflux #117)
Prince of Thralls (Shards of Alara #182)
Rakdos the Defiler (Dissension #129)
Sol'kanar the Swamp King (Legends #259)
Lady Orca (Legends #241)

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