Your search for "Swamp 28" revealed the following:
Combat Commander: Battle Pack #4 - New Guinea is the fourth themed collection of scenarios for use with the Combat Commander series of games. The theme of this fourth Battle Pack shifts to the actions in New Guinea from January 1942 through July...
Swamp (341) (Foil) (INV) from Invasion, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Rob Alexander
Swamp (070) (DDP) from Duel Decks: Zendikar vs. Eldrazi, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Véronique Meignaud
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 (301) (CMA) from Commander Anthology, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jung Park
Swamp (2118) - The Oddlands (Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Ricardo Cavolo Card Text:The Oddlands
Swamp (050) (050) - Art Series (Gold-Stamped Signature) (ABRO) from The Brothers' War Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Sergey Glushakov
Swamp (005) (PALP) from Asia Pacific Land Program, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Edward P. Beard, Jr. Card Text:T: Add B to your mana pool.
Swamp (394) - The Astrology Lands (Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Jeanne D'Angelo Card Text: Zodiac Lands
Swamp (B04) - RNA Ravnica Weekend (Foil) (PRW2) from RNA Ravnica Weekend, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Ravenna Tran
Swamp - Art Series (Gold-Stamped Signature) (AONE) from Phyrexia: All Will Be One Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Julian Kok Joon Wen
Swamp - Art Series (Gold-Stamped Signature) (AFDN) from Foundations Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Steven Belledin
Swamp (014) - Art Series (Gold-Stamped Signature) (AZNR) from Zendikar Rising Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Slawomir Maniak
Swamp (LCI-397) - LCI Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal
Swamp (443) - Retro Frame (CMM) from Commander Masters, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Alayna Danner
Swamp (1090) - Transformers: One Shall Stand, One Shall Fall (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Joana LaFuente Card Text: Transformers: One Shall Fall
Swamp (1470) - Pixel Lands 02.jpg (Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Jubilee Card Text: Pixel Lands 02.jpg
Swamp (240) (Foil) (ROE) from Rise of the Eldrazi, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Véronique Meignaud
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 (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 (450) - Fortnite: Landmarks and Locations (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Kevin Gnutzmans Card Text: Secret Lair × Fortnite: Locations
Swamp (010) - Arena League Promo 2000 (Foil) (PAL00) from Arena League 2000, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Rob Alexander