Seaside Citadel is a land card from the Magic: The Gathering Commander 2017 set, classified as Unknown rarity. Valued at approximately $0.28, it serves as a versatile mana source, providing access to green, white, and blue mana. Its utility in multicolor decks makes it a staple for players seeking to enhance their gameplay strategy. As a non-foil version, it remains accessible for collectors and players alike.