Your search for "Swamp 276" revealed the following:
Swamp - Art Series (Gold-Stamped Signature) (AFDN) from Foundations Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Steven Belledin
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 (295) (CEI) from Intl. Collectors’ Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Dan Frazier Card Text:(This card has square corners and a gold bordered back. Not tournament legal.)Tap to add B to your mana pool....
Swamp (539) - Artist Series: Seb McKinnon (Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Seb McKinnon Card Text: Artist Series: Seb McKinnon(T: Add B.)
Swamp (061) (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 (009) - Arena League Promo 2001 (Foil) (PAL01) from Arena League 2001, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Douglas Shuler
Swamp (003) - Arena League Promo 1996 (PARL) from Arena League 1996, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Tony Roberts Card Text:T: Add B to your mana pool.
Swamp (2118) - The Oddlands (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Ricardo Cavolo Card Text:The Oddlands
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 (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