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Underground Sea (PRM-43624 foil) is a nonbasic dual land with the Island and Swamp subtypes from the Magic Online Promos set. It has the mana ability to tap for either blue or black mana, providing color fixing without entering tapped. As a dual land with basic land types, it enables interactions and deckbuilding synergies that care about Island or Swamp.
Catalog pricing data as of 1 May 2026, 14:32
