42 cards where it’s legal in Brawl and the color identity ≤ GU and the card types include “planeswalker” and the cards aren’t exclusive Planeswalker Deck cards

A-Ellywick Tumblestrum (Adventures in the Forgotten Realms #A-181)
A-Karn, Living Legacy (Dominaria United #A-1)
Arlinn, Voice of the Pack (War of the Spark #150)
Freyalise, Skyshroud Partisan (Jumpstart: Historic Horizons #26)
Garruk, Unleashed (Core Set 2021 #183)
Garruk, Wrath of the Wilds (Alchemy: Innistrad #47)
Jace, Arcane Strategist (Jumpstart 2022 #310)
Jace, Cunning Castaway (Ixalan #60)
Jace, Mirror Mage (Commander Masters #852)
Jace Reawakened (Outlaws of Thunder Junction #271)
Jace, the Perfected Mind (Phyrexia: All Will Be One #57)
Jace, Unraveler of Secrets (Shadows over Innistrad #69)
Jace, Wielder of Mysteries (War of the Spark #54)
Jiang Yanggu, Wildcrafter (War of the Spark #164)
Karn, Scion of Urza (Dominaria #1)
Karn, the Great Creator (Ravnica Remastered #1)
Kasmina, Enigma Sage (Strixhaven: School of Mages #196)
Kasmina, Enigmatic Mentor (War of the Spark #56)
Kiora, Behemoth Beckoner (War of the Spark #232)
Kiora, the Tide's Fury (Jumpstart: Historic Horizons #10)
Mordenkainen (Adventures in the Forgotten Realms #64)
Mu Yanling, Sky Dancer (Core Set 2020 #68)
Narset, Parter of Veils (Commander Masters #853)
Nissa, Ascended Animist (Phyrexia: All Will Be One #175)
Nissa, Steward of Elements (Commander 2020 #224)
Nissa, Vital Force (Kaladesh #163)
Nissa, Who Shakes the World (War of the Spark #169)
Oko, the Ringleader (Outlaws of Thunder Junction #223)
Tamiyo, Collector of Tales (War of the Spark #220)
Tamiyo, Compleated Sage (Kamigawa: Neon Dynasty #238)
Teferi, Master of Time (Core Set 2021 #75)
Teferi, Temporal Pilgrim (The Brothers' War #66)
Tezzeret, Artifice Master (Core Set 2019 #79)
Tezzeret, Betrayer of Flesh (Murders at Karlov Manor Commander #120)
Ugin, the Ineffable (Commander Masters #811)
Vivien, Arkbow Ranger (Core Set 2020 #199)
Vivien, Champion of the Wilds (Commander Legends: Battle for Baldur's Gate #838)
Vivien, Monsters' Advocate (Ikoria: Lair of Behemoths #175)
Vivien on the Hunt (Streets of New Capenna #162)
Vivien Reid (Core Set 2019 #208)
Wrenn and Realmbreaker (March of the Machine #217)
Wrenn and Seven (Innistrad: Midnight Hunt #208)

Their mind whirled with grand plans, never thinking of what might happen if they got to the end of the list.