37 cards where the card types include “planeswalker” and the colors is U

A-Rowan, Scholar of Sparks // A-Will, Scholar of Frost (Strixhaven: School of Mages #A-156)
A-Rowan, Scholar of Sparks // A-Will, Scholar of Frost (Strixhaven: School of Mages #A-156)
B.O.B. (Bevy of Beebles) (Unsanctioned #18)
Jace, Arcane Strategist (War of the Spark #270)
Jace, Architect of Thought (Commander Masters #851)
Jace Beleren (Commander Masters #850)
Jace, Cunning Castaway (Ixalan #60)
Jace, Ingenious Mind-Mage (Ixalan #280)
Jace, Memory Adept (Magic 2014 #60)
Jace, Mirror Mage (Commander Masters #852)
Jace Reawakened (Outlaws of Thunder Junction #271)
Jace, the Living Guildpact (Magic 2015 #62)
Jace, the Mind Sculptor (Double Masters #56)
Jace, the Perfected Mind (Phyrexia: All Will Be One #57)
Jace, Unraveler of Secrets (Shadows over Innistrad #69)
Jace, Vryn's Prodigy // Jace, Telepath Unbound (Magic Origins #60)
Jace, Vryn's Prodigy // Jace, Telepath Unbound (Magic Origins #60)
Jace, Wielder of Mysteries (War of the Spark #54)
Kaito, Cunning Infiltrator (Foundations #44)
Kasmina, Enigmatic Mentor (War of the Spark #56)
Kiora, the Tide's Fury (Jumpstart: Historic Horizons #10)
Mordenkainen (Adventures in the Forgotten Realms #64)
Mu Yanling (Global Series Jiang Yanggu & Mu Yanling #1)
Mu Yanling, Celestial Wind (Core Set 2020 #286)
Mu Yanling, Sky Dancer (Core Set 2020 #68)
Narset, Parter of Veils (Commander Masters #853)
Rowan, Scholar of Sparks // Will, Scholar of Frost (Strixhaven: School of Mages #156)
Rowan, Scholar of Sparks // Will, Scholar of Frost (Strixhaven: School of Mages #156)
Tamiyo, Inquisitive Student // Tamiyo, Seasoned Scholar (Modern Horizons 3 #242)
Tamiyo, Inquisitive Student // Tamiyo, Seasoned Scholar (Modern Horizons 3 #242)
Tamiyo, the Moon Sage (Avacyn Restored #79)
Teferi, Master of Time (Core Set 2021 #75)
Teferi, Temporal Archmage (Commander Masters #125)
Teferi, Temporal Pilgrim (The Brothers' War #66)
Teferi, Timeless Voyager (Core Set 2021 #324)
Tezzeret, Artifice Master (Core Set 2019 #79)
Tezzeret, Betrayer of Flesh (Murders at Karlov Manor Commander #120)
Tezzeret, Cruel Machinist (Core Set 2019 #286)
Tezzeret the Seeker (Modern Masters 2015 #62)
Vronos, Masked Inquisitor (Commander Masters #729)
Will Kenrith (Commander Legends: Battle for Baldur's Gate #738)

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