---
name: "Underground Sea"
mana_cost: "N/A"
cmc: 0
type_line: "Land — Island Swamp"
colors: []
color_identity: ["B", "U"]
keywords: []
set: "2ED"
set_name: "Unlimited Edition"
collector_number: "286"
rarity: "rare"
artist: "Rob Alexander"
oracle_id: "4b22be3a-8ce1-47d1-b82e-6c3ccfb0548b"
canonical_url: "https://avascry.com/printing/underground-sea-2ed"
legalities:
  commander: "legal"
  standard: "not_legal"
  modern: "not_legal"
  pioneer: "not_legal"
  legacy: "legal"
  vintage: "legal"
  pauper: "not_legal"
  penny: "not_legal"
---

# Underground Sea
- **Mana Cost:** `N/A` (CMC: 0)
- **Type:** Land — Island Swamp

## Oracle Text
({T}: Add {U} or {B}.)

## Top 4096-Dim Neural Synergies
1. [Underground River](/printing/underground-river-6ed.md) — Land
2. [Contaminated Aquifer](/printing/contaminated-aquifer-dmu.md) — Land — Island Swamp
3. [Sunken Hollow](/printing/sunken-hollow-clb.md) — Land — Island Swamp
4. [Gloomlake Verge](/printing/gloomlake-verge-pdsk.md) — Land
5. [Rootwater Depths](/printing/rootwater-depths-tmp.md) — Land
6. [Darkwater Catacombs](/printing/darkwater-catacombs-plst.md) — Land

## Printing Details
- **Set:** Unlimited Edition (2ED) #286
- **Rarity:** Rare
- **Artist:** Rob Alexander
- **Total Printings:** 20 across all historical editions

## Format Legalities
Commander: `legal` | Standard: `not_legal` | Modern: `not_legal` | Pioneer: `not_legal` | Legacy: `legal` | Vintage: `legal` | Pauper: `not_legal` | Penny: `not_legal`