The 25 Best Black Blue (Dimir) Lands in Magic

Last updated on February 16, 2026

Watery Grave | Illustration by Svetlin Velinov

Of all of the card types in Magic, one is absolutely crucial: lands. No matter what you plan on doing with a deck, you need some sort of mana generation to get the cards from your hand onto the battlefield. It’s a necessary evil for the vast majority of decks. I can’t remember hearing anyone ever saying that lands were their favorite cards (art aside).

Let's check which Dimir lands are best for your blue-black decks.

What Are Dimir Lands in MTG?

Undercity Sewers | Illustration by Yeong-Hao Han

A Dimir land has an exact blue and black color identity and the land card type. They tap for and/or or feature those mana symbols somewhere in their rules text, usually on an activated ability.

With the 3+ decades that Magic has been around, there’s myriad lands to choose from. You're probably wondering which ones in Dimir () are worth running. I’ve ranked the best black blue lands based on the following criteria:

• Speed: How quickly it can generate mana once it enters the battlefield.
• Versatility: How many colors it can generate.
• Utility: Other abilities besides mana generation.
• Legality: Which formats it can be used in.

Ready to take a look? Let's jump right in!

Honorable Mentions

There are some lands that don’t pass the usability criteria but are overall good lands. Let's take a look at them before we get into the meat of the rankings.

Duskmantle, House of Shadow and Nephalia Drownyard each tap for colorless mana but have activated abilities to mill a few cards. Filling up your graveyard or manipulating the top of your library could be important, but you have better options.

Frost Marsh and Ice Tunnel might come into play tapped but they’re snow lands, allowing you to pay for snow costs. That said, regular tapped lands are hardly ever worth it.

Secluded Glen works the same as a true dual land, if you’re playing a faerie deck and willing to reveal one from your hand. Otherwise it works like Dimir Guildgate, which is just too slow without any other benefit.

#25. Soured Springs

It's probably worth mentioning this land real quick because… wait a minute, is this card called Soured Springs? Uh, ok then. Anyway, the pinging deserts from Outlaws of Thunder Junction aren't too exciting, until you can turn them into a synergy piece. Committing crimes was heavily associated with the Grixis spectrum, and cards like Intimidation Campaign and Marchesa, Dealer of Death would be happy to pair up with this tap land.

#24. Serpent's Pass

Lands that do extra are often worth it and Serpent's Pass can be just the permanent you need to send to the graveyard or dig for that key spell.

#23. Inundated Archive

Waterlogged Teachings is one of the harder Modern Horizons 3 MDFCs to parse out. It's an expensive, restricted tutor, but it also spots you Inundated Archive when you just need a land. Flash decks like Nymris, Oona's Trickster and Alela, Cunning Conqueror make good use of an instant that fetches more instant-speed spells.

#22. Sinister Hideout

The easy way to surveil is great on Sinister Hideout and means so much in and. Though expensive, the repeatable source of surveil can save your deck.

#21. Dimir Aqueduct

Dimir Aqueduct comes into play tapped and has an additional cost of returning another land you control to your hand. Effectively using this land requires some structure.

Its additional cost can be mitigated by returning an already tapped land to your land, maybe even one that has an ETB trigger. And you’ll still be on tempo for mana since it taps for by itself.

#20. Darkwater Catacombs

While Darkwater Catacombs’ ability requires you to spend mana to generate some, it creates one blue and one black mana. This means that if you feed in a blue mana, you get it back plus a black mana, and vice versa if you feed in a black mana.

You can also feed it colorless, or whatever other color may be available to you, if you’re running three or more colors. A handy bit of mana fixing.

#19. Fetid Pools

Fetid Pools comes into play tapped, but having a land that can be cycled later on is quite beneficial. Its ability to draw you a card gives it the extra versatility it needs to be playable.

#18. Tainted Isle

Tainted Isle enters untapped but produces colorless mana unless you also control a swamp. Since most decks play basic lands on top of nonbasics it should be relatively easy to get this online early.

#17. Mistvault Bridge

The usefulness of the Modern Horizons 2 bridges is entirely dependent on how much artifacts matter for your deck. If you're playing a Dimir deck with any semblance of an artifact theme, Mistvault Bridge becomes one of your best lands. Secret Passage is another artifact-centric land, but significantly worse.

#16. Restless Reef

The cheaper activation and evasion on Creeping Tar Pit barely edges out Restless Reef as far as Dimir's creature lands are concerned. Restless Reef exists in a Standard without Tar Pit, though, so it's an important part of midrange and control decks alike.

#15. Creeping Tar Pit

Although Creeping Tar Pit comes into play tapped, it can be tapped for both blue and black mana. It can also become a 3/2 unblockable elemental creature until the end of the turn for .

I can’t tell you how many times this has helped me finish off my opponents’ life totals. I love this card and was very happy to see it come back in the New Capenna precon and Commander Legends: Battle for Baldur’s Gate.

#14. Shipwreck Marsh

Shipwreck Marsh comes into play tapped unless you already control at least two other lands. Obviously not great in the early turns, but this is just golden once you have your first two lands down.

#13. Darkslick Shores

Darkslick Shores is a card you want in your opening hand because it comes in untapped if you control two or fewer other lands. This and other fast lands are great picks for building a solid mana base since the early turns are usually the most important turns of a game.

#12. Drowned Catacomb

Drowned Catacomb enters untapped if you control an island or a swamp. You’re more than likely getting a dual land in untapped very early since the likelihood of you having one of those two basics in your opening hand should be high.

#11. Choked Estuary

Choked Estuary is known as a “reveal land.” It comes into play tapped unless you reveal an island or swamp card from your hand. You can reveal duals and tri-lands with the type, though, so you've got some range on what cards you need with this one.

#10. Morphic Pool

Morphic Pool was introduced in Battlebond and only works in multiplayer games. Since the format of Battlebond was more akin to Two-Headed Giant than Standard, you pretty much always had two opponents.

These Battlebond lands are a staple in most Commander decks for the same reason and tend to come in untapped unless they're drawn very late in the game.

#9. Sunken Hollow

Sunken Hollow is a slow land, but it does eventually start coming in untapped. The cherry on top for this card is that it has got both basic land types. That means it can get fetched, and if you're fetching later in the game, it's practically an Underground Sea!

#8. Gloomlake Verge

The Verges are mostly improvements over their respective check lands. Gloomlake Verge is already a strictly better Island, and getting the second color is as easy as playing a basic or typed dual land of your two colors.

#7. Clearwater Pathway / Murkwater Pathway

While Clearwater Pathway technically isn’t a dual land, it does offer you some mana fixing by choosing whichever color you need the most. And you can always return it with a bounce land and flip the color if you need to.

#6. Sunken Ruins

Unlike its brother Darkwater Catacombs, Sunken Ruins allows some more complex mana filtering options. It requires you to feed it either a black or blue but then lets you add either , , or to your mana pool. It also comes in untapped, so it can go to work right away.

#5. Underground River

Underground River comes into play untapped and can generate colorless mana or allow you to use your life as a resource to have it generate blue or black mana. It may seem odd that this is higher than some of the other choices that can also come in untapped and generate those two colors, but the main benefit here is that this pain land can come in on turn 1 and generate either color without the help of another mana source.

It’s also a helpful tool to teach newer players that life is a resource.

#4. Undercity Sewers

The UB surveil land is the best of the bunch. I mean, they're all fantastic, but UB is an exceptional graveyard color pair, and even houses some of the actual surveil payoffs like Mirko, Obsessive Theorist and Blood Operative. These are the best lands printed since the Battlebond lands and belong in the top tier of land cycles.

#3. Polluted Delta

While Polluted Delta won't generate mana itself, you can sacrifice it to fetch an island or swamp from your library. This is great for mana fixing, finding another nonbasic with the island or swamp type, or to just shuffle your library.

It also pairs exceptionally well with the next couple of cards….

#2. Watery Grave

Watery Grave can enter tapped, or untapped at the cost of 2 life. This has the same strengths as Underground River except you only pay 2 life once as it enters.

#1. Underground Sea

Underground Sea is one of the original dual lands that was printed starting in Alpha. There’s a reason these cards are so sought after, and it goes beyond the fact that they’re some of the first cards ever printed.

These are very simple lands that do one thing and do it well: come in untapped and generate two colors of mana. No strings attached.

Wrap Up

Underground Sea | Illustration by Rob Alexander

Lands are a constant in every deck. Some can run a few, most run a lot, and some use them as a win condition. They’re such an important part of the game that they tend to be some of the most expensive cards out there.

But this list only looked at the lands that work with both black and blue. Looking at exclusively blue or exclusively black lands may also lead you to some interesting options for your next deck’s mana base.

Do you think some other lands should have made the list? Is there one you think could unseat the true dual for the top spot? Let us know in our Discord, on Twitter, or in the comments.

That's all from me for now. Stay safe, stay healthy, and wash your hands!