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Rarity:	R
Card Type:	Land
Description:	T: Add either B or U to your mana pool.Counts as both swamp and islands and is affected by spells that affect either. If a spell destroys one of these land types, this card is destroyed; if a spell alters one of these land types, the other land type is unaffected.
TCGplayer Tip:	Underground Sea is one of THE original dual lands, first printed all the way back in Alpha. Its utilty and rarity make it highly prized.