35 cards where the card types include “swamp”

Badlands (Vintage Masters #291)
Bayou (Vintage Masters #293)
Blood Crypt (Ravnica Remastered #273)
Canyon Slough (Duskmourn: House of Horror Commander #266)
Contaminated Aquifer (Dominaria United #245)
Fetid Pools (Outlaws of Thunder Junction Commander #296)
Gate of the Black Dragon (Alchemy Horizons: Baldur's Gate #77)
Geothermal Bog (Duskmourn: House of Horror Commander #278)
Godless Shrine (Ravnica Remastered #277)
Haunted Mire (Dominaria United #248)
Ice Tunnel (Kaldheim #262)
Indatha Triome (Ikoria: Lair of Behemoths #248)
Leechridden Swamp (Duskmourn: House of Horror Commander #286)
Overgrown Tomb (Ravnica Remastered #283)
Raffine's Tower (Streets of New Capenna #254)
Raucous Theater (Murders at Karlov Manor #266)
Savai Triome (Ikoria: Lair of Behemoths #253)
Scrubland (Vintage Masters #313)
Shadowy Backstreet (Murders at Karlov Manor #268)
Smoldering Marsh (Duskmourn: House of Horror Commander #299)
Snow-Covered Swamp (Kaldheim #280)
Snowfield Sinkhole (Commander Legends: Battle for Baldur's Gate #915)
Sulfurous Mire (Kaldheim #270)
Sunken Hollow (Outlaws of Thunder Junction Commander #325)
Sunlit Marsh (Dominaria United #257)
Swamp (Foundations #276)
Undercity Sewers (Murders at Karlov Manor #270)
Underground Mortuary (Murders at Karlov Manor #271)
Underground Sea (Vintage Masters #323)
Watery Grave (Ravnica Remastered #291)
Witch's Cottage (Throne of Eldraine #249)
Woodland Chasm (Kaldheim #274)
Xander's Lounge (Streets of New Capenna #260)
Zagoth Triome (Ikoria: Lair of Behemoths #259)
Ziatora's Proving Ground (Streets of New Capenna #261)

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