![Underground Sea (CE) [CED - N/A] SM38 While an opponent is searching](https://cdn.shopify.com/s/files/1/0700/7168/1242/files/97649.jpg?v=1756076863)
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While an opponent is searching their library
• Counter target blue spell
2025-05-02
Creature Type or Sub Type: Creature — Elemental Hydra
Rules Text Contains: Creatures you control have "T: Add one mana of any color
Underground Sea (CE) [CED - N/A] SM38 While an opponent is searchingRarity: R Creature Type or Sub Type: Land Rules Text Contains: (This card has square corners and a gold bordered back. Not tournament legal.) Counts as both swamp and islands and is affected by spells that affect either. Tap to add either B or U to your mana pool.
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