Your search for "Swamp 237" revealed the following:
Swamp (384) - The Astrology Lands (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Jeanne D'Angelo Card Text: Zodiac Lands(T: Add B.)
Swamp (009) - Arena League Promo 2001 (Foil) (PAL01) from Arena League 2001, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Douglas Shuler
Swamp (241) - The Unfathomable Crushing Brutality of Basic Lands (Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Mark Riddick Card Text: Brutal Basic Lands
Swamp (LCI-397) - LCI Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal
Swamp (059) (ITP) from Introductory Two-Player Set, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Dan Frazier Card Text:T: Add B to your mana pool.The version of this card features a Copyright date of © 1996.
Swamp (010) (PALP) from Asia Pacific Land Program, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Ron Spears Card Text:T: Add B to your mana pool.
Swamp (062) (DDC) from Duel Decks: Divine vs. Demonic, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Vance Kovacs
Swamp (890) - Deceptive Districts (Rainbow Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Alexander Khabbazi
Swamp (009) - Arena League Promo 1999 (Foil) (PAL99) from Arena League 1999, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: John Avon Card Text:T: Add B to your mana pool.
Swamp (015) (PELP) from European Land Program, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Mike Ploog
Swamp - The Tokyo Lands Secret Lair (Etched) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Mr. Misang Card Text: The Tokyo Lands
Swamp (Foil) (UST) from Unstable, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: John Avon
Swamp (291) (LEA) from Limited Edition Alpha, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Dan Frazier
Swamp - Art Series (Gold-Stamped Signature) (AFDN) from Foundations Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Steven Belledin
Swamp (048) - The Tokyo Lands - Japanese (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Mr. Misang Card Text: The Tokyo Lands
Swamp (005) (PELP) from European Land Program, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Scott Bailey