36 cards where the set is “pwar” and the cards are Japanese-exclusive alternate-art War of the Spark planeswalkers

Ajani, the Greathearted (War of the Spark Promos #184s★)
Angrath, Captain of Chaos (War of the Spark Promos #227s★)
Arlinn, Voice of the Pack (War of the Spark Promos #150s★)
Ashiok, Dream Render (War of the Spark Promos #228s★)
Chandra, Fire Artisan (War of the Spark Promos #119s★)
Davriel, Rogue Shadowmage (War of the Spark Promos #83s★)
Domri, Anarch of Bolas (War of the Spark Promos #191s★)
Dovin, Hand of Control (War of the Spark Promos #229s★)
Gideon Blackblade (War of the Spark Promos #13s★)
Huatli, the Sun's Heart (War of the Spark Promos #230s★)
Jace, Wielder of Mysteries (War of the Spark Promos #54s★)
Jaya, Venerated Firemage (War of the Spark Promos #135s★)
Jiang Yanggu, Wildcrafter (War of the Spark Promos #164s★)
Karn, the Great Creator (War of the Spark Promos #1s★)
Kasmina, Enigmatic Mentor (War of the Spark Promos #56s★)
Kaya, Bane of the Dead (War of the Spark Promos #231s★)
Kiora, Behemoth Beckoner (War of the Spark Promos #232s★)
Liliana, Dreadhorde General (War of the Spark Promos #97s★)
Nahiri, Storm of Stone (War of the Spark Promos #233s★)
Narset, Parter of Veils (War of the Spark Promos #61s★)
Nicol Bolas, Dragon-God (War of the Spark Promos #207s★)
Nissa, Who Shakes the World (War of the Spark Promos #169s★)
Ob Nixilis, the Hate-Twisted (War of the Spark Promos #100s★)
Ral, Storm Conduit (War of the Spark Promos #211s★)
Saheeli, Sublime Artificer (War of the Spark Promos #234s★)
Samut, Tyrant Smasher (War of the Spark Promos #235s★)
Sarkhan the Masterless (War of the Spark Promos #143s★)
Sorin, Vengeful Bloodlord (War of the Spark Promos #217s★)
Tamiyo, Collector of Tales (War of the Spark Promos #220s★)
Teferi, Time Raveler (War of the Spark Promos #221s★)
Teyo, the Shieldmage (War of the Spark Promos #32s★)
The Wanderer (War of the Spark Promos #37s★)
Tibalt, Rakish Instigator (War of the Spark Promos #146s★)
Ugin, the Ineffable (War of the Spark Promos #2s★)
Vivien, Champion of the Wilds (War of the Spark Promos #180s★)
Vraska, Swarm's Eminence (War of the Spark Promos #236s★)

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