Underground Sea is one of the ten original dual lands from Magic: The Gathering, producing both Island and Swamp mana without entering the battlefield tapped. The Revised Edition printing is the most commonly graded version, though it still commands premium prices in high grades due to its staple status in Legacy and Vintage formats. PSA 9 copies represent a sweet spot between affordability and condition for serious collectors.
The Card Official's ruling
Hold to Buy — The most valuable dual land in Magic. Alpha and Beta copies in PSA 9 regularly trade above $10,000 — treat them as collectibles first, playables second. Revised copies are the entry point for Legacy players and represent strong long-term holds. A staple in every blue-black Legacy strategy including Grixis Delver, BUG Depths, and Reanimator. Demand is permanent — this card will never be reprinted in a tournament-legal form
Price snapshot · PSA 10
PSA 10?The currently selected grade. Switch grades above to compare any two grades against each other.
$9,500
?The grade you want to compare against. Defaults to the lowest available grade — change it to see how any two grades compare.
$475
Tracked Grade Multiple?How many times more the selected grade sells vs the compare grade. A high multiple means grading could be very profitable.
20.0x
Price spread?The percentage difference between the low and high price estimate. A tight spread means consistent pricing; a wide spread means more volatility.
1900%
Grades tracked?How many different grades we have price data for on this card — raw, PSA, BGS and others. More grades means a fuller picture of market value.
9
Last priced?When our AI last updated the price estimate for this card. Prices are refreshed weekly.
