Underground Sea

Underground Sea is not on our list of commonly-counterfeited cards, but counterfeits exist across every set. Check the print quality and cardstock (real cards have a distinctive blue inner core visible from the edge), the rosette pattern on the back, the security stamp on planeswalker / mythic cards from recent sets, and confirm the collector number and set code match the official Scryfall record. For high-value copies we recommend submitting to a professional grader (PSA, BGS, CGC) for tamper-evident authentication.

As of the latest data, there are no active listings on The Game Traders right now. Actual value depends on condition, grading, edition and printing variant — graded high-condition copies (PSA 9–10) trade at a substantial premium over raw copies.

Underground Sea is from the Magic: The Gathering set "Legacy Championship" in the memorabilia series, released in 2011.

Underground Sea is a special card in the Legacy Championship set.