45 cards where the card is in the modern deck/cube and the card types include “planeswalker”

Ajani, Mentor of Heroes (JOU)
Ajani Vengeant (DDH)
Ashiok, Nightmare Weaver (THS)
Chandra, Awakened Inferno (M20)
Chandra, Torch of Defiance (KLD)
Domri, Anarch of Bolas (WAR)
Elspeth, Knight-Errant (MMA)
Elspeth, Sun's Champion (THS)
Garruk, Apex Predator (M15)
Garruk, Primal Hunter (C19)
Garruk Relentless // Garruk, the Veil-Cursed (ISD)
Garruk Relentless // Garruk, the Veil-Cursed (ISD)
Garruk Wildspeaker (CMD)
Gideon, Ally of Zendikar (BFZ)
Gideon Jura (M12)
Jace Beleren (M11)
Jace, the Mind Sculptor (A25)
Jace, Vryn's Prodigy // Jace, Telepath Unbound (ORI)
Jace, Vryn's Prodigy // Jace, Telepath Unbound (ORI)
Karn Liberated (UMA)
Karn, Scion of Urza (DOM)
Koth of the Hammer (DDI)
Kytheon, Hero of Akros // Gideon, Battle-Forged (ORI)
Kytheon, Hero of Akros // Gideon, Battle-Forged (ORI)
Liliana, Dreadhorde General (WAR)
Liliana, Heretical Healer // Liliana, Defiant Necromancer (ORI)
Liliana, Heretical Healer // Liliana, Defiant Necromancer (ORI)
Liliana of the Veil (UMA)
Liliana, the Last Hope (EMN)
Nahiri, the Harbinger (SOI)
Narset, Parter of Veils (WAR)
Nicol Bolas, Dragon-God (WAR)
Nissa, Vastwood Seer // Nissa, Sage Animist (ORI)
Nissa, Vastwood Seer // Nissa, Sage Animist (ORI)
Nissa, Vital Force (KLD)
Nissa, Voice of Zendikar (OGW)
Nissa, Who Shakes the World (WAR)
Ob Nixilis Reignited (C19)
Ral, Izzet Viceroy (GRN)
Saheeli Rai (KLD)
Sarkhan the Masterless (WAR)
Sorin, Grim Nemesis (SOI)
Sorin, Solemn Visitor (KTK)
Tamiyo, the Moon Sage (AVR)
Teferi, Hero of Dominaria (DOM)
Ugin, the Spirit Dragon (FRF)
Vivien Reid (M19)
Vraska, Relic Seeker (XLN)
Wrenn and Six (MH1)
Xenagos, the Reveler (THS)

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