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({T}: Add {U} or {B}.)
Abilities, attacks, weakness & resistance
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Underground Sea (OLGC-2016EU normal) is a nonbasic Land with the Island and Swamp subtypes from the Legacy Championship memorabilia set. It has the mana ability to tap for either blue or black ({T}: Add {U} or {B}). Its presence supports decks that need reliable dual-color fixing and interacts with cards that reference land subtypes rather than basic land status.
Catalog pricing data as of 26 Apr 2026, 12:59
