■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
Grixis Control
- Player : Migita Koki
- Tournament : Daily Event Standard/Modern/Legacy/Pionner in Fukuoka
- Score : 3-0
- Participants : 10
- Date : 2025/11/29
Dimir Tempo
- Player : Kojima Kosuke
- Tournament : Premium promo pack Struggle Legacy
- Score : 3-0
- Participants : 7
- Date : 2025/11/29
Show and Tell
- Player : Yamaguchi Shota
- Tournament : 103th All In Legacy Tournament (single elimination)
- Score : Finalist
- Participants : 22
- Date : 2025/11/29
■Vintage
Oath
- Player : Kajiwara Yuta
- Tournament : Premium promo pack Struggle Vintage
- Score : 3-0
- Participants : 6
- Date : 2025/11/29
Esper Lurrus
- Player : Goto Hiroaki
- Tournament : Holiday Vintage2025/11/29
- Score : 4-0
- Participants : 8
- Date : 2025/11/29
Reanimator
- Player : Miura Akinori
- Tournament : Vintage Championship Autumn 2025
- Score : 5th Place
- Participants : 66
- Date : 2025/11/22
■Commander
Don Andres, the Renegade
- Player : Harada Shogo
- Tournament : Commander Meeting Light
- Score : 盛り上げハッピー
- Participants :
- Date : 2025/11/29
Silas Renn, Seeker Adept
- Player : Yuasa Takuji
- Tournament : Omiya Weekday Commander Bracket 4 - 2025/11/27
- Score : 勝利
- Participants : 3
- Date : 2025/11/27
Don Andres, the Renegade
- Player : Harada Shogo
- Tournament : Commander Meeting Light
- Score : 盛り上げ
- Participants :
- Date : 2025/11/26