Brainstorm from the Magic: The Gathering Double Masters set is a promo printing of the classic blue instant, listed with an Unknown rarity. Collectors can place it within casual and legacy-focused decks where Brainstorm sees play, and its current market value is shown as $0.00. The Unknown rarity and promo status may appeal to completest collectors despite no recorded sales price. Condition and grading would affect desirability if future sales data appears.