Your search for "swamp 81" revealed the following:
Swamp (js439) (WC97) (Jakub Šlemr) from World Championship Decks 1997, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Andrew Robinson Card Text:T: Add B to your mana pool.Not a Tournament Legal card.
Swamp (341) (6ED) from Classic Sixth Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Douglas Shuler
Swamp (486) (MH2) from Modern Horizons 2, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Pete Venters
Swamp (718) - Scroll Showcase (Surge Foil) (LTR) from The Lord of the Rings: Tales of Middle-earth, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Deven Rue
Swamp - Art Series (Gold-Stamped Signature) (ATMT) from Teenage Mutant Ninja Turtles Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Gaboleps
Swamp (196) (Foil) (SPM) from Marvel's Spider-Man, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Jonas De Ro
Swamp (151) (HOP) from Planechase, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Martina Pilcerova
Swamp (341) (Foil) (8ED) from Eighth Edition, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Dan Frazier
Swamp - Full Art (Foil) (UND) from Unsanctioned, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Adam Paquette
Swamp (311) (40K) from Warhammer 40,000 Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Johan Grenier
Swamp (288) (NEO) from Kamigawa: Neon Dynasty, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Adam Paquette Card Text:T: Add B.
Swamp (264) (ORI) from Magic Origins, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jung Park
Swamp (288) (Foil) (NEO) from Kamigawa: Neon Dynasty, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Adam Paquette Card Text:T: Add B.
Swamp (271) (Foil) (M19) from Core Set 2019, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Christine Choi
Swamp (269) (Foil) (M19) from Core Set 2019, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Mike Bierek
Swamp (348) (C13) from Commander 2013, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Andreas Rocha
Swamp - Oil Slick (367) (Foil) (ONE) from Phyrexia: All Will Be One, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Daria Khlebnikova
Swamp (282) (MSH) from Marvel Super Heroes, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Sylvia Liu
Swamp (241) - The Unfathomable Crushing Brutality of Basic Lands (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Mark Riddick Card Text: Brutal Basic Lands
Swamp (341) (ONS) from Onslaught, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Dan Frazier
Swamp (311) (Surge Foil) (40K) from Warhammer 40,000 Commander, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Johan Grenier
Swamp (406) - Retro Frame (DMR) from Dominaria Remastered, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Titus Lunter
Swamp (158) (P02) from Portal Second Age, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Susan Van Camp
Swamp (341) (Foil) (MMQ) from Mercadian Masques, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Rob Alexander
Swamp (313) (40K) from Warhammer 40,000 Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Andrey Nyarl
Swamp (791) (CMM) from Commander Masters, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Sam Burley
Swamp (261) (DOM) from Dominaria, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Mark Poole
Swamp (717) - Scroll Showcase (Surge Foil) (LTR) from The Lord of the Rings: Tales of Middle-earth, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Deven Rue
Swamp (485) (MH2) from Modern Horizons 2, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jerry Tiritilli
Swamp (258) (ISD) from Innistrad, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jung Park
Swamp (347) (C13) from Commander 2013, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jung Park
Swamp (287) (Foil) (NEO) from Kamigawa: Neon Dynasty, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Piotr Dura Card Text:T: Add B.
Swamp (104) (DPA) from Duels of the Planeswalkers, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jim Pavelec
Swamp (339) (ODY) from Odyssey, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jerry Tiritilli
Swamp (299) (C18) from Commander 2018, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Aleksi Briclot
Swamp (281) (DSK) from Duskmourn: House of Horror, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Martin de Diego Sádaba
Swamp (849) (Surge Foil) (PIP) from Fallout, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Samuele Bandini
Swamp (377) (2XM) from Double Masters, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: John Avon
Swamp (1192) - Post Malone: The Lands (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Ron Spears & Post Malone Card Text: Secret Lair × Post Malone: The Lands
Swamp - Full Art (514) (First-Place Foil) (DFT) from Aetherdrift, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Calder Moore
Swamp - Borderless (REX) from Jurassic World Collection, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Pablo Rivera
Swamp (340) (ONS) from Onslaught, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Doug Chaffee
Swamp (js441) (WC97) (Jakub Šlemr) from World Championship Decks 1997, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Andrew Robinson Card Text:T: Add B to your mana pool.Not a Tournament Legal card.
Swamp (291) (SHM) from Shadowmoor, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Warren Mahy
Swamp (332) (C15) from Commander 2015, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Cliff Childs
Swamp (321) (PIP) from Fallout, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Samuele Bandini
Swamp (142) (ARC) from Archenemy, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Susan Van Camp
Swamp (462) (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Sam White
Swamp (557) - Jumpstart Lands (Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Piotr Dura Card Text: Foil Jumpstart Lands(T: Add B.)
Swamp (105) (Foil) (ACR) from Assassin's Creed, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Wei Guan