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({T}: Add {U} or {B}.)
Abilities, attacks, weakness & resistance
Other cards from Foreign Black Border
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Underground Sea (FBB-290) is a rare dual land with subtypes Island and Swamp from the Foreign Black Border set. It taps to add either blue or black mana, providing flexible fixing for two-color or multicolor decks. Its basic land types mean it shares effects tied to those types but it is not itself a basic land, so some "basic land" specific effects may not apply.
Catalog pricing data as of 18 Apr 2026, 18:37
