Swamp [B] is a basic land card from the Alpha set of Magic: The Gathering, categorized as Unknown rarity. As a staple of black mana production, it holds significant value for collectors, currently priced at $46.00. Its historical importance as part of the game's inaugural set contributes to its desirability in the market. Sales data indicates that Alpha basic lands remain sought after, reflecting their enduring relevance in gameplay and collection.