Your search for "Seaside Citadel 231" revealed the following:
Seaside Citadel (DMC) from Dominaria United Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U.
Seaside Citadel (Foil) (ALA) from Shards of Alara, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Volkan Baǵa Card Text:Seaside Citadel comes into play tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel (CMA) from Commander Anthology, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel (ALA) from Shards of Alara, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel comes into play tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel (Foil) (MM3) from Modern Masters 2017, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel (MM3) from Modern Masters 2017, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel - ALA Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel comes into play tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel (TRC) from Star Trek Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Paolo Puggioni Card Text:This land enters tapped.T: Add G, W, or U.
Seaside Citadel (C18) from Commander 2018, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U.
Seaside Citadel (AFC) from Forgotten Realms Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U.
Plains (231) (AVR) from Avacyn Restored, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Jung Park
Plains (231) (Foil) (AVR) from Avacyn Restored, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Jung Park
Plains (231) (Foil) (THS) from Theros, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Steven Belledin
Seaside Citadel (C13) from Commander 2013, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel (BLC) from Bloomburrow Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters tapped.T: Add G, W, or U.
Seaside Citadel (CM2) from Commander Anthology Volume II, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U.
Seaside Citadel (C16) from Commander 2016, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel (NCC) from New Capenna Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U.
Seaside Citadel (ECC) from Lorwyn Eclipsed Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:This land enters tapped.T: Add G, W, or U.
Seaside Citadel (C17) from Commander 2017, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U to your mana pool.
Seaside Citadel - MKC Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Volkan Baǵa Card Text:Seaside Citadel enters the battlefield tapped.T: Add G, W, or U.
Seaside Citadel (Surge Foil) (FIC) from Final Fantasy Commander, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Hristo D. Chukov Card Text:This land enters tapped.T: Add G, W, or U.