Blinkmoth Nexus

Land

: Add to your mana pool.

: Blinkmoth Nexus becomes a 1/1 Blinkmoth artifact creature with flying until end of turn. It's still a land.

, : Target Blinkmoth creature gets +1/+1 until end of turn.

Darksteel Citadel

Artifact Land

Indestructible (Effects that say "destroy" don't destroy this land.)

: Add to your mana pool.

Panopticon, forge of the Darksteel Eye, home of Mirrodin's keeper.

Mirrodin's Core

Land

: Add to your mana pool.

: Put a charge counter on Mirrodin's Core.

, Remove a charge counter from Mirrodin's Core: Add one mana of any color to your mana pool.

Ancient Den

Artifact Land

(Ancient Den isn't a spell.)

: Add to your mana pool.

Blinkmoth Well

Land

: Add to your mana pool.

, : Tap target noncreature artifact.

Cloudpost

Land - Locus

Cloudpost enters the battlefield tapped.

: Add to your mana pool for each Locus on the battlefield.

Glimmervoid

Land

At the beginning of the end step, if you control no artifacts, sacrifice Glimmervoid.

: Add one mana of any color to your mana pool.

Great Furnace

Artifact Land

(Great Furnace isn't a spell.)

: Add to your mana pool.

Seat of the Synod

Artifact Land

(Seat of the Synod isn't a spell.)

: Add to your mana pool.

Stalking Stones

Land

: Add to your mana pool.

: Stalking Stones becomes a 3/3 Elemental artifact creature that's still a land. (This effect lasts indefinitely.)

Tree of Tales

Artifact Land

(Tree of Tales isn't a spell.)

: Add to your mana pool.

Vault of Whispers

Artifact Land

(Vault of Whispers isn't a spell.)

: Add to your mana pool.

City of Brass

Land

Whenever City of Brass becomes tapped, it deals 1 damage to you.

: Add one mana of any color to your mana pool.

Coastal Tower

Land

Coastal Tower enters the battlefield tapped.

: Add or to your mana pool.

A beacon in the night, a dream in the fog.

Elfhame Palace

Land

Elfhame Palace enters the battlefield tapped.

: Add or to your mana pool.

The elfhames are the closest thing to "civilization" the elves allow themselves.

Salt Marsh

Land

Salt Marsh enters the battlefield tapped.

: Add or to your mana pool.

Only death breeds in stagnant water.
-Urborg saying

Shivan Oasis

Land

Shivan Oasis enters the battlefield tapped.

: Add or to your mana pool.

Only the hardiest explorers survive to eat the fruit.

Urborg Volcano

Land

Urborg Volcano enters the battlefield tapped.

: Add or to your mana pool.

Deep in the heart of Urborg lie massive volcanoes whose thick black smoke covers the land with perpetual darkness.