Mana Leak [Foil], a card from the Magic: The Gathering Modern Masters 2015 set, features a blue counterspell that allows players to disrupt their opponent's spells for a low mana cost. Classified as an Unknown rarity, it currently holds a market value of $0.50. Collectors appreciate its versatility in various formats, making it a staple in blue control decks. The foil version adds an extra layer of appeal for those seeking enhanced aesthetics in their collections.