The Mox Opal Masterpiece Series: Kaladesh Inventions Foil Playtest Card is a rare and highly sought after collectible card for Magic: The Gathering enthusiasts. This artifact card, numbered 19 in the set, is colorless and has a mythic rarity. It features a stunning foil finish and is in English language. Known as the "Mox Opal," this card has a cost of 0 and is a valuable addition to any Magic: The Gathering card collection.