56 cards where the card types include “planeswalker” and the mana value = 3

Ajani, Caller of the Pride (Magic 2014 #1)
Aminatou, the Fateshifter (Double Masters 2022 #169)
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)
Ashiok, Dream Render (War of the Spark #228)
Ashiok, Nightmare Weaver (Theros #188)
Basri Ket (Core Set 2021 #7)
Chandra, Acolyte of Flame (Core Set 2020 #126)
Chandra, Dressed to Kill (Innistrad: Crimson Vow #149)
Chandra, Fire of Kaladesh // Chandra, Roaring Flame (Magic Origins #135)
Chandra, Fire of Kaladesh // Chandra, Roaring Flame (Magic Origins #135)
Dack Fayden (Eternal Masters #199)
Dakkon, Shadow Slayer (Modern Horizons 2 #192)
Daretti, Ingenious Iconoclast (Conspiracy: Take the Crown #74)
Davriel, Rogue Shadowmage (War of the Spark #83)
Domri, Anarch of Bolas (War of the Spark #191)
Domri Rade (Ravnica Remastered #179)
Dovin, Grand Arbiter (Crimson Vow Commander #153)
Dovin, Hand of Control (War of the Spark #229)
Freyalise, Skyshroud Partisan (Jumpstart: Historic Horizons #26)
Gideon Blackblade (Ravnica Remastered #20)
Gideon of the Trials (Amonkhet #14)
Grist, the Hunger Tide (Modern Horizons 2 #202)
Huatli, the Sun's Heart (War of the Spark #230)
Jace Beleren (Commander Masters #850)
Jace, Cunning Castaway (Ixalan #60)
Jace, Mirror Mage (Commander Masters #852)
Jeska, Thrice Reborn (Commander Legends #186)
Jiang Yanggu, Wildcrafter (War of the Spark #164)
Kaito Shizuki (Kamigawa: Neon Dynasty #226)
Kasmina, Enigma Sage (Strixhaven: School of Mages #196)
Kaya, Geist Hunter (Innistrad: Crimson Vow #240)
Kaya, Orzhov Usurper (Ravnica Remastered #194)
Kiora, Behemoth Beckoner (War of the Spark #232)
Liliana, Heretical Healer // Liliana, Defiant Necromancer (Commander Collection: Black #1)
Liliana, Heretical Healer // Liliana, Defiant Necromancer (Commander Collection: Black #1)
Liliana of the Veil (Dominaria United #97)
Liliana, the Last Hope (Double Masters 2022 #81)
Mila, Crafty Companion // Lukka, Wayward Bonder (Strixhaven: School of Mages #153)
Mila, Crafty Companion // Lukka, Wayward Bonder (Strixhaven: School of Mages #153)
Mu Yanling, Sky Dancer (Core Set 2020 #68)
Narset, Parter of Veils (Commander Masters #853)
Niko Aris (Kaldheim #225)
Nissa, Vastwood Seer // Nissa, Sage Animist (Magic Origins #189)
Nissa, Vastwood Seer // Nissa, Sage Animist (Magic Origins #189)
Nissa, Voice of Zendikar (Duel Decks: Nissa vs. Ob Nixilis #1)
Ob Nixilis, the Adversary (Streets of New Capenna #206)
Oko, Thief of Crowns (Throne of Eldraine #197)
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)
Saheeli Rai (Kaladesh #186)
Saheeli, Sublime Artificer (Commander Masters #935)
Sarkhan, Fireblood (Core Set 2019 #154)
Sorin, Imperious Bloodlord (Core Set 2020 #115)
Teferi, Time Raveler (Ravnica Remastered #232)
Teyo, Geometric Tactician (Commander Masters #725)
Teyo, the Shieldmage (War of the Spark #32)
The Royal Scions (Throne of Eldraine #199)
Tibalt, Rakish Instigator (War of the Spark #146)
Tyvar, Jubilant Brawler (Phyrexia: All Will Be One #218)
Vivien, Champion of the Wilds (Commander Legends: Battle for Baldur's Gate #838)
Wrenn and Realmbreaker (March of the Machine #217)

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