■Card Description
| Name | Underground Sea |
| Color | Colorless |
| Cost | |
| Cardtype | Land |
| Subtype | Island Swamp |
| Rarity | Rare |
| Oracle | ({Tap}: Add {Blue} or {Black}.) |
| Flavor Text | |
| Expansion | Limited Edition Alpha |
| Illustrator | Rob Alexander |
| Legality | Legacy,Vintage,Commander |
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■Legacy
Ninja
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- Tournament : Shizuoka Daily Event
- Score : 3-0
- Participants : 3
- Date : 2025/12/15
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■Vintage
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- Player : シロトリ リョウスケ
- Tournament : Let's 5 Vintage
- Score : 5-0
- Participants : 8
- Date : 2025/12/13
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- Participants : 45
- Date : 2025/12/05
Doomsday
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- Tournament : Vintage Challenge 32 - 2025/12/05
- Score : 3rd Place
- Participants : 45
- Date : 2025/12/05
■Commander
Silas Renn, Seeker Adept
- Player : Yuasa Takuji
- Tournament : Omiya Weekday Commander Bracket 4 - 2025/12/14
- Score : 勝利
- Participants : 3
- Date : 2025/12/14
Marchesa, Dealer of Death
- Player : Takeda Ryuhei
- Tournament : "Emperor of Commonder" Pre-event Commander
- Score : TOP4
- Participants : 7
- Date : 2025/12/14
Kraum, Ludevic's Opus
- Player : Sugino Taisei
- Tournament : "Emperor of Commonder" Pre-event Commander
- Score : TOP4
- Participants : 7
- Date : 2025/12/14