26 cards where the card types include “demon” and it’s legal in Future Standard

Archfiend of the Dross (Phyrexia: All Will Be One #82)
Blade of the Oni (Kamigawa: Neon Dynasty #89)
Bloodletter of Aclazotz (The Lost Caverns of Ixalan #92)
Bringer of the Last Gift (The Lost Caverns of Ixalan #94)
Death-Rattle Oni (March of the Machine: The Aftermath #13)
Dreadfeast Demon (Innistrad: Crimson Vow #108)
Dreadhound (Innistrad: Midnight Hunt #97)
Ecstatic Awakener // Awoken Demon (Innistrad: Midnight Hunt #100)
Ecstatic Awakener // Awoken Demon (Innistrad: Midnight Hunt #100)
Etched Host Doombringer (March of the Machine #102)
Falco Spara, Pactweaver (Streets of New Capenna #186)
Heirloom Mirror // Inherited Fiend (Innistrad: Midnight Hunt #105)
Heirloom Mirror // Inherited Fiend (Innistrad: Midnight Hunt #105)
Hidetsugu and Kairi (March of the Machine #228)
Hidetsugu, Devouring Chaos (Kamigawa: Neon Dynasty #99)
Jerren, Corrupted Bishop // Ormendahl, the Corrupter (Innistrad: Midnight Hunt #109)
Jerren, Corrupted Bishop // Ormendahl, the Corrupter (Innistrad: Midnight Hunt #109)
Jetmir, Nexus of Revels (Streets of New Capenna #193)
Lord of the Forsaken (Innistrad: Midnight Hunt #110)
Lord Xander, the Collector (Streets of New Capenna #197)
Ob Nixilis, Captive Kingpin (March of the Machine: The Aftermath #41)
Raffine, Scheming Seer (Streets of New Capenna #213)
Rakdos, Patron of Chaos (Murders at Karlov Manor #224)
Rakdos, the Muscle (Outlaws of Thunder Junction #226)
Sol'Kanar the Tainted (Dominaria United #219)
Thraxodemon (The Brothers' War #115)
Tyrannical Pitlord (Dominaria United #284)
Vito, Fanatic of Aclazotz (The Lost Caverns of Ixalan #243)
Ziatora, the Incinerator (Streets of New Capenna #231)

The message was clear to Sorin—time to search for something else.