Underwater Tunnel // Slimy Aquarium
Enchantment — Room // Enchantment — Room
When you unlock this door, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)
- CMC
- 5
- Mana cost
- Color identity
- U
- Rarity
- common
- Set
- Duskmourn: House of Horror
- Price
- $0.14
- EDHREC rank
- #11085
Underwater Tunnel // Slimy Aquarium gives blue creatures islandwalk on the front half and transforms into a land that taps for blue and generates a 1/1 Fish token — all for two mana at sorcery speed. It does real work in islandwalk-tribal shells but is too narrow to earn a slot outside them.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | legal |
| vintage | legal |
| pauper | legal |
| oathbreaker | legal |
In Commander, Underwater Tunnel // Slimy Aquarium slots cleanly into Merfolk or Fish-tribal builds that want to push islandwalk damage through, and the Slimy Aquarium back half doubles as ramp and token generation once the front-side effect is no longer needed. Outside tribal, the card has almost no home — islandwalk is irrelevant against opponents who don't run Islands. In non-rotating formats like Legacy and Modern it is legal but essentially invisible, outclassed by every dedicated blue-creature payoff in those pools. Standard and Pioneer offer the most plausible non-Commander use case if a Fish synergy deck ever surfaces, but that archetype has yet to materialize competitively.
Key Combos
Combo lines featuring this card
Price Context
Current price
$0.14 bulk tier
At $0.14, Underwater Tunnel // Slimy Aquarium is deep bulk — you can pick up a playset for less than a pack of sleeves. Bulk dual-faced cards with narrow tribal applications rarely climb unless a dedicated archetype breaks out, so expect the price to stay flat.
Explore
Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.