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

Ajani Goldmane (M11)
Ajani, Mentor of Heroes (JOU)
Ajani Vengeant (DDH)
Arlinn Kord // Arlinn, Embraced by the Moon (SOI)
Arlinn Kord // Arlinn, Embraced by the Moon (SOI)
Ashiok, Nightmare Weaver (THS)
Chandra, Fire of Kaladesh // Chandra, Roaring Flame (ORI)
Chandra, Fire of Kaladesh // Chandra, Roaring Flame (ORI)
Chandra, Flamecaller (OGW)
Chandra Nalaar (JVC)
Chandra, Pyromaster (M15)
Chandra, Torch of Defiance (KLD)
Elspeth, Knight-Errant (MD1)
Elspeth, Sun's Champion (DDO)
Garruk, Primal Hunter (M13)
Garruk Relentless // Garruk, the Veil-Cursed (ISD)
Garruk Relentless // Garruk, the Veil-Cursed (ISD)
Garruk Wildspeaker (GVL)
Gideon, Ally of Zendikar (BFZ)
Gideon Jura (M12)
Jace, Architect of Thought (DDM)
Jace Beleren (JVC)
Jace, Vryn's Prodigy // Jace, Telepath Unbound (ORI)
Jace, Vryn's Prodigy // Jace, Telepath Unbound (ORI)
Karn Liberated (MM2)
Koth of the Hammer (DDI)
Kytheon, Hero of Akros // Gideon, Battle-Forged (ORI)
Kytheon, Hero of Akros // Gideon, Battle-Forged (ORI)
Liliana, Heretical Healer // Liliana, Defiant Necromancer (ORI)
Liliana, Heretical Healer // Liliana, Defiant Necromancer (ORI)
Liliana of the Veil (MM3)
Liliana, the Last Hope (EMN)
Nahiri, the Harbinger (SOI)
Nicol Bolas, God-Pharaoh (HOU)
Nissa, Steward of Elements (AKH)
Nissa, Vastwood Seer // Nissa, Sage Animist (ORI)
Nissa, Vastwood Seer // Nissa, Sage Animist (ORI)
Nissa, Voice of Zendikar (DDR)
Ob Nixilis Reignited (DDR)
Ral Zarek (DGM)
Sarkhan, the Dragonspeaker (KTK)
Sorin, Grim Nemesis (SOI)
Sorin, Lord of Innistrad (DDK)
Sorin Markov (M12)
Tamiyo, the Moon Sage (AVR)
Ugin, the Spirit Dragon (FRF)
Vraska the Unseen (DDM)

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