27 cards where the card was in “common” and the card is available on Paper and it’s not legal in Pauper and it’s not legal in Future Standard and it’s legal in Vintage and it’s not banned in Pauper

Bound by Moonsilver (Shadows over Innistrad #7)
Drogskol Shieldmate (Eldritch Moon #22)
Spiritual Guardian (Portal #27)
Battleground Geist (Jumpstart #139)
Essence Flux (Jumpstart #151)
Geist of the Archives (Eldritch Moon #62)
Imprisoned in the Moon (March of the Machine Commander #224)
Waterkin Shaman (Core Set 2020 #288)
Demogorgon's Clutches (Adventures in the Forgotten Realms #96)
Gisa's Bidding (Shadows over Innistrad #114)
Morkrut Necropod (Shadows over Innistrad #125)
Conduit of Storms // Conduit of Emrakul (Eldritch Moon #124)
Conduit of Storms // Conduit of Emrakul (Eldritch Moon #124)
Deranged Whelp (Eldritch Moon #125)
Incendiary Flow (Eldritch Moon #133)
Insatiable Gorgers (Eldritch Moon #134)
Ravenous Bloodseeker (Shadows over Innistrad #175)
You Find Some Prisoners (Adventures in the Forgotten Realms #169)
Briarbridge Patrol (Shadows over Innistrad #195)
Gnarlwood Dryad (Eldritch Moon #159)
Hollowhenge Scavenger (Innistrad #188)
Moonlight Hunt (Shadows over Innistrad #219)
Obsessive Skinner (Shadows over Innistrad #220)
Weirding Wood (March of the Machine Commander #315)
Cursed Rack (Fourth Edition #312)
Epitaph Golem (Core Set 2021 #230)
Iron Golem (Adventures in the Forgotten Realms #247)
Wild-Field Scarecrow (Shadows over Innistrad #269)

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