■Card Description
| Name | Underground Sea |
| Color | Colorless |
| Cost | |
| Cardtype | Land |
| Subtype | Island Swamp |
| Rarity | Rare |
| Oracle | ({Tap}: Add {Blue} or {Black}.) |
| Flavor Text | |
| Expansion | Revised Edition |
| Illustrator | Rob Alexander |
| Legality | Legacy,Vintage,Commander |
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■Legacy
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- Tournament : Wednesday Legacy 3R [Recommended Day]
- Score : 3-0
- Participants : 4
- Date : 2026/11/04
Doomsday
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- Tournament : Shizuoka Daily event
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- Participants : 3
- Date : 2026/11/04
Doomsday
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- Tournament : Shizuoka Daily Event
- Score : 2-0
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- Date : 2026/11/04
■Vintage
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- Player : Nanamori Kohei
- Tournament : 《悪魔の教示者》Singles competition vintage
- Score : TOP4
- Participants : 10
- Date : 2026/11/03
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- Player : Fujihira Kohei
- Tournament : 《悪魔の教示者》Singles competition vintage
- Score : 準優勝
- Participants : 10
- Date : 2026/11/03
Esper Lurrus
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- Tournament : Vintage Challenge 32 - 2026/10/24
- Score : 1st Place
- Participants : 45
- Date : 2026/10/24
■Commander
Rona, Herald of Invasion
- Player : Yamashita Ryogo
- Tournament : Nipponbasi Commandar Cup EX
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- Participants : 9
- Date : 2026/11/03
Tivit, Seller of Secrets
- Player : ヨシザワ ヒロキ
- Tournament : Commander Cup: 10,000 Points at Stake
- Score : Top4
- Participants : 15
- Date : 2026/11/03
Marchesa, Dealer of Death
- Player : Sugino Taisei
- Tournament : Nipponbasi Commandar Cup EX
- Score : Top4
- Participants : 9
- Date : 2026/11/03