48 cards where the card types include “serpent”

Aesi, Tyrant of Gyre Strait (Commander Legends #365)
Benthic Behemoth (Seventh Edition #63)
Biolume Egg // Biolume Serpent (Innistrad: Crimson Vow #49)
Biolume Egg // Biolume Serpent (Innistrad: Crimson Vow #49)
Bladecoil Serpent (The Brothers' War #229)
Bog Serpent (Planar Chaos #84)
Cryptic Serpent (Commander Masters #83)
Deep-Sea Serpent (Portal #51)
Deep-Sea Terror (Magic Origins #52)
Denizen of the Deep (Dominaria Remastered #47)
Dirgur Nemesis (Dragons of Tarkir #51)
Dreamwinder (Odyssey #83)
Floodtide Serpent (Born of the Gods #41)
Frilled Sea Serpent (Core Set 2020 #61)
Gearseeker Serpent (Kaladesh #48)
Harbor Serpent (Magic 2013 #53)
Invasion of Segovia // Caetus, Sea Tyrant of Segovia (March of the Machine #63)
Invasion of Segovia // Caetus, Sea Tyrant of Segovia (March of the Machine #63)
Junk Winder (Murders at Karlov Manor Commander #107)
Koma, Cosmos Serpent (Murders at Karlov Manor Commander #213)
Kukemssa Serpent (Mirage #72)
Lava Serpent (Ikoria: Lair of Behemoths #124)
Lightning Serpent (Coldsnap #88)
Lochmere Serpent (Throne of Eldraine #195)
Marjhan (Masters Edition II #54)
River Serpent (Amonkhet #66)
Ronom Serpent (Coldsnap #45)
Sandbar Serpent (Urza's Saga #95)
Scrapdiver Serpent (Commander Legends #94)
Sea Monster (Tempest Remastered #65)
Sea Serpent (Masters Edition IV #60)
Serpent of the Endless Sea (Magic 2010 #70)
Serpent of Yawning Depths (Theros Beyond Death #291)
Shoal Serpent (Zendikar #65)
Shrouded Serpent (Prophecy #47)
Slinking Serpent (Invasion #274)
Slipstream Serpent (Time Spiral Remastered #86)
Sliptide Serpent (Nemesis #43)
Spire Serpent (Duel Decks: Mirrodin Pure vs. New Phyrexia #15)
Steelclad Serpent (Shards of Alara #59)
Striped Riverwinder (Hour of Devastation #48)
Sword Coast Serpent // Capsizing Wave (Commander Legends: Battle for Baldur's Gate #99)
Taniwha (Mirage #95)
Tolarian Serpent (Weatherlight #57)
Tolarian Terror (Dominaria United #72)
Verazol, the Split Current (Zendikar Rising #239)
Vodalian Serpent (Invasion #86)
Wormhole Serpent (Strixhaven: School of Mages #62)
Xolatoyac, the Smiling Flood (The Lost Caverns of Ixalan Commander #8)
Yorion, Sky Nomad (Ikoria: Lair of Behemoths #232)

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