17 cards where the card types include “demon” and the colors ≥ U

Prince of Thralls (Shards of Alara #182)
Illusory Demon (Alara Reborn #21)
Gyruda, Doom of Depths (Ikoria: Lair of Behemoths #221)
Falco Spara, Pactweaver (Streets of New Capenna #186)
Lord Xander, the Collector (Streets of New Capenna #197)
Raffine, Scheming Seer (Streets of New Capenna #213)
Sol'Kanar the Tainted (Dominaria United #219)
Be'lakor, the Dark Master (Warhammer 40,000 Commander #6)
Heralds of Tzeentch (Warhammer 40,000 Commander #23)
Lord of Change (Warhammer 40,000 Commander #24)
Exalted Flamer of Tzeentch (Warhammer 40,000 Commander #119)
Magnus the Red (Warhammer 40,000 Commander #131)
Pink Horror (Warhammer 40,000 Commander #136)
Sol'kanar the Swamp King (Dominaria Remastered #200)
Hidetsugu and Kairi (March of the Machine #228)
Rakshasa Vizier (Khans of Tarkir #193y)
Silent-Blade Oni (Outlaws of Thunder Junction Commander #241)

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