29 cards where the card is tagged “tutor-swamp”

A-Sprouting Goblin (Dominaria United #A-145)
Bad River (Dominaria United Commander #197)
Bloodstained Mire (Modern Horizons 3 #216)
Boseiju, Who Endures (Kamigawa: Neon Dynasty #266)
Corpse Harvester (Planechase #22)
Farseek (Ravnica Remastered #138)
Gaea's Balance (Apocalypse #77)
Gem of Becoming (Magic 2013 #205)
Gloomfang Mauler (March of the Machine #108)
Igneous Pouncer (Duel Decks: Ajani vs. Nicol Bolas #57)
Injector Crocodile (March of the Machine #329)
Jhessian Zombies (Duel Decks: Ajani vs. Nicol Bolas #56)
Korlash, Heir to Blackblade (Future Sight #87)
Liliana of the Dark Realms (Magic 2014 #102)
Liliana's Shade (Magic 2013 #98)
Lukamina, Moon Druid (Alchemy Horizons: Baldur's Gate #17)
Marsh Flats (Modern Horizons 2 #248)
Nervous Gardener (Murders at Karlov Manor #169)
Perilous Forays (Ravnica: City of Guilds #176)
Polluted Delta (Modern Horizons 3 #224)
Rampaging Spiketail (The Lost Caverns of Ixalan #116)
Rocky Tar Pit (Commander Masters #1021)
Shard Convergence (Conflux #91)
Slimefoot's Survey (Dominaria United #178)
Spoils of Victory (Commander 2013 #172)
Sprouting Goblin (Dominaria United #145)
Troll of Khazad-dûm (The Lord of the Rings: Tales of Middle-earth #111)
Twisted Abomination (Commander Masters #194)
Verdant Catacombs (Modern Horizons 2 #260)

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