Your search for "Swamp 56" revealed the following:
Swamp (268) (DMU) from Dominaria United, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Seb McKinnon
Swamp (263) (ORI) from Magic Origins, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: James Paick
Swamp (258) (Foil) (DOM) from Dominaria, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Jonas De Ro
Swamp (313) (40K) from Warhammer 40,000 Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Andrey Nyarl
Swamp (273) - Full Art (ZNR) from Zendikar Rising, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Slawomir Maniak
Swamp (281) (MSH) from Marvel Super Heroes, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Marc Aspinall
Swamp (331) (C15) from Commander 2015, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: John Avon
Swamp (341) (Foil) (MMQ) from Mercadian Masques, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Rob Alexander
Swamp (264) - Celestial Borderless (EOE) from Edge of Eternities, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Adam Paquette
Swamp (347) (C13) from Commander 2013, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jung Park
Swamp (264) (CLU) from Ravnica: Clue Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Christopher Moeller
Swamp (061) (GVL) from Duel Decks Anthology: Garruk vs. Liliana, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Christopher Moeller
Swamp (260) (Foil) (M15) from Magic 2015, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Jonas De Ro
Swamp (341) (SCD) from Starter Commander Decks, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jonas De Ro
Swamp (260) (Foil) (RTR) from Return to Ravnica, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: John Avon
Swamp (267) (IKO) from Ikoria: Lair of Behemoths, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jesper Ejsing
Swamp (347) (7ED) from Seventh Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Rob Alexander
Swamp (849) (Surge Foil) (PIP) from Fallout, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Samuele Bandini
Swamp (295) (C19) from Commander 2019, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jonas De Ro
Swamp (333) (C15) from Commander 2015, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jonas De Ro
Swamp (440) (5ED) from Fifth Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Andrew Robinson Card Text:T: Add B to your mana pool.
Swamp (260) (M15) from Magic 2015, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jonas De Ro
Swamp (142) (ARC) from Archenemy, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Susan Van Camp
Swamp (334) (C15) from Commander 2015, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jung Park
Swamp (060) (GVL) from Duel Decks Anthology: Garruk vs. Liliana, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Stephan Martiniere
Swamp (264) (Foil) (RTR) from Return to Ravnica, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Richard Wright
Swamp (082) (BTD) from Beatdown Box Set, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: John Avon
Swamp (261) (DOM) from Dominaria, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Mark Poole
Swamp (241) (Foil) (M12) from Magic 2012, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Alan Pollack
Swamp (js440) (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 (312) (40K) from Warhammer 40,000 Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Calder Moore
Swamp (342) (Foil) (MMQ) from Mercadian Masques, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Terry Springer
Swamp (267) (SNC) from Streets of New Capenna, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Adam Paquette
Swamp (276) (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 (272) (AFR) from Adventures in the Forgotten Realms, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Titus Lunter
Swamp (339) (6ED) from Classic Sixth Edition, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Romas Kukalis
Swamp (382) (ZNR) from Zendikar Rising, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Adam Paquette
Swamp (089) (J25) from Foundations Jumpstart, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Kasia 'Kafis' Zielińska
Swamp (159) (P02) from Portal Second Age, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Susan Van Camp
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 (034) (BRC) from The Brothers' War Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Robin Olausson
Swamp (382) (Foil) (ZNR) from Zendikar Rising, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Adam Paquette
Swamp (260) (KTK) from Khans of Tarkir, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Adam Paquette
Swamp (271) (M19) from Core Set 2019, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Christine Choi
Swamp (272) (Foil) (M20) from Core Set 2020, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Jonas De Ro
Swamp (268) (IKO) from Ikoria: Lair of Behemoths, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Svetlin Velinov
Swamp (281) (Foil) (ECL) from Lorwyn Eclipsed, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Raoul Vitale
Swamp (377) (2XM) from Double Masters, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: John Avon
Swamp (236) (Foil) (AVR) from Avacyn Restored, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: James Paick
Swamp (285) (Foil) (FRA) from Reality Fracture, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Josu Solano