25 cards where the text includes “any combination of colors”

Altar of the Lost (Dark Ascension #144)
Axebane Guardian (Return to Ravnica #115)
Cascading Cataracts (Dominaria United Commander #202)
Chandra, Hope's Beacon (March of the Machine #134)
Crucible of the Spirit Dragon (Forgotten Realms Commander #231)
Dawn's Reflection (Commander 2018 #139)
Great Hall of the Citadel (The Lord of the Rings: Tales of Middle-earth #254)
Gwenna, Eyes of Gaea (The Brothers' War #185)
Key to the Archive (Alchemy: Innistrad #59)
Klauth, Unrivaled Ancient (Forgotten Realms Commander #50)
Leyline Immersion (March of the Machine: The Aftermath #21)
Manamorphose (Double Masters #208)
Market Festival (Journey into Nyx #130)
Orb of Dragonkind (Adventures in the Forgotten Realms #157)
Plasm Capture (Outlaws of Thunder Junction Commander #237)
Prismatic Geoscope (Commander 2016 #55)
Realm-Scorcher Hellkite (Wilds of Eldraine #145)
Rivaz of the Claw (Dominaria United #215)
Sarkhan, Fireblood (Core Set 2019 #154)
Selvala, Heart of the Wilds (Commander Masters #320)
Shaman of Forgotten Ways (Dragons of Tarkir #204)
Smokebraider (Modern Masters 2015 #125)
Terrarion (Jumpstart #488)
The Golden Throne (Warhammer 40,000 Commander #157)
Wizard's Rockets (The Lord of the Rings: Tales of Middle-earth #252)

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