Underground Sea


Format Legality
Tiny Leaders Legal
Noble Legal
Leviathan Legal
Magic Duels Legal
Canadian Highlander Legal
Vintage Legal
Penny Dreadful Legal
Custom Legal
Oldschool 93/94 Legal
MTGO Legal
Vanguard Legal
Legacy Legal
Archenemy Legal
Planechase Legal
1v1 Commander Legal
Duel Commander Legal
Oathbreaker Legal
Unformat Legal
Casual Legal
Commander / EDH Legal

Printings View all

Set Rarity
Vintage Masters (VMA) Rare
Masters Edition IV (ME4) Rare
Masters Edition II (ME2) Rare
Revised Edition (3ED) Rare
Revised Foreign Black Border (3EDFBB) Rare
Unlimited Edition (2ED) Rare
Collector's Edition (CED) Rare
International Collector's Edition (CEI) Rare
Limited Edition Beta (LEB) Rare
Limited Edition Alpha (LEA) Rare

Combos Browse all

Underground Sea

Land — Island Swamp

(: Add or to your mana pool.)

Underground Sea Discussion

RNR_Gaming on cEDH Mimeogasm

7 hours ago

You have the core of a cedh deck but you need a much faster land base. Come into play tap lands have no place in a competitive game. Upgrading to duals like Underground Sea , Bayou , and Tropical Island along with fetches like Polluted Delta , Misty Rainforest and Verdant Catacombs will increase the speed and consistency of the deck but also ups the price tag ridiculously high; I suggest playing with proxies in non-sanactioned tournaments to get a real feel for CEDH. If you're interested in the format don't limit yourself to a budget and find a play group with the same mentality so you can actually test at full power not 50%.

multimedia on Alas Poor Yarok

2 weeks ago

Hey, nice version of Yarok.

My card suggestions for you to consider can help to improve the manabase. With a $700+ budget and having Underground Sea there's many even budget lands to consider adding.

Lands to consider cutting:

  • Temple of the False God
  • Dismal Backwater
  • Khalni Garden
  • Skyline Cascade
  • Golgari Rot Farm
  • Memorial to Unity
  • Memorial to Genius
  • Terramorphic Expanse
  • Barren Moor
  • Temple of Malady
  • Temple of Mystery

These are 10 lands that ETB tapped and even though some of these lands trigger Yarok it's not worth it. There's so many better land options that can ETB untapped.

PartialPride on Competitive Food Chain Prossh

2 months ago

ThePrimalShift. I think you may misunderstand me somewhat. I just looked at your list and we play basically the same lands (except for Prismatic Vista and Nurturing Peatland ) meaning that our manabase is very optimized. We don’t have any pain lands and we both have true duals so we don’t have to resort to shocking ourselves, plus we’re in green so dorks help a ton. So relative to other decks our lands aren’t hurting us as much. What I was originally trying to say was that I’ve found that Urborg, Tomb of Yawgmoth tends to help my opponents more than it helps me. It doesn’t really save me damage and I don’t really need all my lands to be swamps because 99% of the time I’m fetching Bayou on turn one plus I always prioritizing finding B/G lands. What I have seen it do is turn the Kess players manabase (who can’t afford a Tropical Island or Underground Sea ) from pain lands and Ancient Tomb into damage free mana. Or suddenly the Thrasios/Tymna player now has access to black. Both of those scenarios, I think, have worse outcomes for us than the benefits it provides which is why I think it might just be better as a basic. Maybe it’s a meta call, but I’ve played many games with this deck across a number of groups and never found it to be quite as good as I’ve wanted.

Also I couldn’t help but notice you run craterhoof. That seems like a odd choice to me given we have a number of other, more efficient, win cons. The high CMC also doesn’t play nicely with Ad Nauseam and Dark Confidant . Why the inclusion?

Demarge on Challenge of Budget

2 months ago

ok, now I see Underground Sea -> Underground Sea a much bigger price drop from Sol Ring to Worn Powerstone

Though I feel this playlist of cards under $1 can cover most of these questions or just the whole youtube channel (if you ignore the part where he does deck techs not including the commander's price in the budget)

Demarge on Challenge of Budget

2 months ago

well instead of say a Underground Sea you could glue an island and swamp together, though the glue might be more expensive than the two basics.

I suppose you could even just buy a sharpie and draw on a bunch of draft chaff and proxy a whole deck, I'm sure a casual playgroup would be fine with it.

(you maybe writing a comment about what you mean on top this, but this is somewhat fun)

Boza on Does WotC Have a Responsibility ...

3 months ago

And one more thing:

  • Underground Sea is not the card you want to "flip for profit" as a speculator. What you want to target is cards with extremely low supply where one person or group can scoop up the whole supply at once - like Moat for example.

Literally no-one plays moat. It is a 1-of in some sideboards at best and a decent commander card. But it jumped 500% in a week due to a buyout. However, Moat is not worth 1000$ - nobody is buying at that price (people are barely buying it at the 800 it is currently) - it is simply due to supply shortage and speclative offerings that it costs as much.

This is entirely different from Underground Sea - people play the dual lands. The price for them is a combo of short supply and extremely high demand. Not due to speculation.

sylvannos on Does WotC Have a Responsibility ...

3 months ago

I don't care how inexpensive cards are, so long as it means more people playing the game. This notion of putting the game behind a paywall is nonsense.

The entire purpose of separating MtG into Type 1 and Type 2 is because Black Lotus hit $100 on the secondary market. While it's more profitable for WotC to make chase cards to sell booster boxes, it's harmful to FNM and other event attendance. I'm worried most about prices for Standard, Legacy, and Vintage.

For Standard, new players can't play the format meant for new players when it costs $400+ for most competitive decks. The two cheapest decks in the format are RDW and White Weenie, which are roughly $150 to $200, depending on the build. Even that is a steep price for people who just want to try the game out.

For Legacy and Vintage, the Reserved List is going to kill those formats. Obviously, the people who play those formats aren't concerned about prices. What they are affected by is the fact speculators and investors are buying up RL cards so they can hold them while their prices increase. Every time someone buys an Underground Sea to speculate on its price to try and flip it for profit, that's another Underground Sea that will never be played. This puts a hard cap on the number of Legacy and Vintage players.

So long as there aren't any viable decks that can be built for cheap using cards not on the RL, Legacy and Vintage will continue to shrink as players can't find cards because buying those cards up and sitting on them is more cost effective than using those cards to play in events.

SynergyBuild on Tezzeret/Thoughtcast Affinity

3 months ago

Fatal Push, Underground River, and Mental Misstep are under $5 dollars, so I'm not going to give replacements on those, but for Ancient Tomb , City of Traitors , Glimmervoid , Inkmoth Nexus , Mox Opal , and Mox Diamond , I'd replace those with 3 Islands and a Swamp and add a River of Tears and Spire of Industry .

BTW, did you mean Underground Sea when you typed Underground River ? In which case I'd add Underground River over Underground Sea anyway.

For Force of Will , I'd use Steel Sabotage , it acts as an occasional counter and protection for your artifacts if you bounce them in response to removal, or to reuse them in case of Renaming a new card with Revoker or getting another cast trigger on Sai, etc.

Spellskite is harder, for this Lightning Greaves would be my pick, but Swiftfoot Boots additionally works for budgetary reasons.

Arcbound Ravager is the hardest. Any other artifact based finisher you'd like can work, but Mirrodin Besieged is my favorite.

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Underground Sea occurrence in decks from the last year


All decks: 1.33%

Commander / EDH:

All decks: 0.05%

WUB (Esper): 0.65%

UBR (Grixis): 0.56%