Seaside Citadel is a land card from the Magic: The Gathering Commander 2016 set, classified as an Unknown rarity. It provides mana of three different colors, making it a versatile option for multicolor decks. Currently valued at $0.36, it holds a modest position in the market, appealing to collectors and players looking to enhance their mana base without significant investment. Its utility in various strategies contributes to its ongoing demand among casual and competitive players alike.