How can I tell if my Underground Sea is fake?

Compare it to the genuine reference, then run these tests in order: Back comparison, Light test, Print/rosette test. No single test is proof — combine several.

Fake Underground Sea: How to Spot a Counterfeit

Genuine reference · Limited Edition Alpha · 1993

Why it's counterfeited

The most expensive original dual land. Reserved List status means no reprints, so counterfeiters fill the gap.

Holo stamp / era: 1993–94 print — no holo stamp. Compare the back color carefully.

Best tests for this card

Run these in order — they catch the fakes of this card most reliably.

1Back comparison — Compare standard Magic backs with a known-genuine reference. Genuine color variation exists, and double-faced cards do not have the standard back.
2Light test — Compare light transmission with a known-genuine non-foil of the same printing. A mismatch is a reason to investigate, not a verdict.
3Print/rosette test — Compare colored halftone dots and solid black details under magnification. Rosettes alone do not prove a card is genuine.

Look up another card's reference →All detection methods →

Educational guidance only — not a guarantee of authenticity. For a high-value Underground Sea, use a professional grading or authentication service. Card image via Scryfall; Magic: The Gathering is © Wizards of the Coast.