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({T}: Add {U} or {B}.)
Abilities, attacks, weakness & resistance
Other cards from 30th Anniversary Edition
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Underground Sea (30A-578) is a nonbasic Land with the Island and Swamp subtypes from the 30th Anniversary Edition. It can be tapped to add either blue or black mana. Its basic land types make it interact with effects that reference land types, while it is not a basic land itself and thus is unaffected by effects that target only basic lands.
Catalog pricing data as of 22 Apr 2026, 20:00
