Watermarket

{T}: Add {C}{C}. Spend this mana only to cast spells with watermarks.

Madlands

Madlands enters the battlefield tapped.
{T}: Add {B} or {R}.
Madness {0} (If you discard this card, discard it into exile. When you do, play it for its madness cost or put it into your graveyard. You can play a land only during your turn and only if you have an available land play remaining.)

Urza's Fun House

{T}: Add {C}.
{T}: Add {∞}. Activate only once and only if you control an Urza's Mine, an Urza's Power-Plant, and an Urza's Tower.
{7}, {T}: Head to AskUrza.com and click Urza's Fun House.

Glacial Chasm

Cumulative upkeep—Pay 2 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When this land enters, sacrifice a land.
Creatures you control can't attack.
Prevent all damage that would be dealt to you.

Talon Gates of Madara

When this land enters, up to one target creature phases out.
{T}: Add {C}.
{1}, {T}: Add one mana of any color.
{4}: Put this card from your hand onto the battlefield.

Aggressive Crag

At the beginning of your combat step, tap Aggressive Crag.
{T}: Add {R} or {W}.

Arena of Glory

This land enters tapped unless you control a Mountain.
{T}: Add {R}.
{R}, {T}, Exert this land: Add {R}{R}. If that mana is spent on a creature spell, it gains haste until end of turn. (An exerted permanent won't untap during your next untap step.)

Ormendahl, Profane Prince

Westvale Abbey

{T}: Add {C}.
{5}, {T}, Pay 1 life: Create a 1/1 white and black Human Cleric creature token.
{5}, {T}, Sacrifice five creatures: Transform this land, then untap it.

Westvale Abbey // Ormendahl, Profane Prince

Library of Alexandria

{T}: Add {C}.
{T}: Draw a card. Activate only if you have exactly seven cards in hand.

Nearby Planet

Rangeling (This card is every land type, including Plains, Island, Swamp, Mountain, Forest, Desert, Gate, Lair, Locus, and all those Urza's ones.)
This land enters tapped.
When this land enters, sacrifice it unless you pay {1}.

Field of the Dead

This land enters tapped.
{T}: Add {C}.
Whenever this land or another land you control enters, if you control seven or more lands with different names, create a 2/2 black Zombie creature token.

Barry's Land

Taiga Stadium

Taiga Stadium enters tapped unless you control a white, blue, or black permanent.
{T}: Add {R} or {G}.

Gold Mine

{T}: Add {C}.
Legacy — {T}, Mark one of Gold Mine's unmarked nodes: Add one mana of any color.
☐, ☐, ☐, ☐, ☐

Karakas

{T}: Add {W}.
{T}: Return target legendary creature to its owner's hand.

The Big Top

{T}: Add one mana of any color that appears on your top. (A top is an outerwear garment worn on the upper body.)

City of Ass

This land enters tapped.
{T}: Add one and one-half mana of any one color.

The Tabernacle at Pendrell Vale

All creatures have "At the beginning of your upkeep, destroy this creature unless you pay {1}."

Mishra's Workshop

{T}: Add {C}{C}{C}. Spend this mana only to cast artifact spells.

Forsaken Crossroads

Forsaken Crossroads enters the battlefield tapped.
As Forsaken Crossroads enters the battlefield, choose a color.
When Forsaken Crossroads enters the battlefield, scry 1. If you weren't the starting player, you may untap Forsaken Crossroads instead.
{T}: Add one mana of the chosen color.