■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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Decks that include this card
■Legacy
Dimir Tempo
- Player : Nakamura Akira
- Tournament : Legacy recommended day in Fukuoka 2026/01/08
- Score : 3-0
- Participants : 4
- Date : 2026/01/08
Dimir Tempo
- Player : Nagao Akio
- Tournament : Daily [PML]
- Score : 3-0
- Participants : 6
- Date : 2026/01/08
Dimir Tempo
- Player : ナンバ ヤスノブ
- Tournament : Promo pack Legacy!
- Score : 3-0
- Participants : 5
- Date : 2026/01/07
■Vintage
Dimir Lurrus
- Player : O_danielakos
- Tournament : Vintage Showcase Challenge - 2026/01/02
- Score : 1st Place
- Participants : 161
- Date : 2026/01/02
Dimir Lurrus
- Player : HJ_Kaiser
- Tournament : Vintage Showcase Challenge - 2026/01/02
- Score : 2nd Place
- Participants : 161
- Date : 2026/01/02
Oath
- Player : BERNASTORRES
- Tournament : Vintage Showcase Challenge - 2026/01/02
- Score : 4th Place
- Participants : 161
- Date : 2026/01/02
■Commander
Tivit, Seller of Secrets
- Player : Yoshimoto Tomofumi
- Tournament : "Emperor of Commonder" Pre-event Commander
- Score : Top4
- Participants : 13
- Date : 2026/01/04
Tivit, Seller of Secrets
- Player : Fukumoto Kazuki
- Tournament : "Emperor of Commonder" Pre-event Commander
- Score : Champion
- Participants : 13
- Date : 2026/01/04
Kraum, Ludevic's Opus
- Player : Saito Shoya
- Tournament : "Emperor of Commonder" Pre-event Commander
- Score : Top4
- Participants : 13
- Date : 2026/01/04