Slow land

Slow lands is a term that refers to a cycle of uncommon lands that can be tapped for or one mana of two allied colors; if tapped for colored mana, they do not untap during their controller's next untap step. The drawback is significant compared to taplands; slow lands give an advantage exactly the turn drawn but will cost a mana every second turn, whereas taplands, which enter the battlefield tapped (costing one mana, once), are dual lands every point after that.

List of Slow Lands
The slow lands were first introduced in Tempest. They were later functionally reprinted in Champions of Kamigawa.
 * Thalakos Lowlands (/)
 * Rootwater Depths (/)
 * Cinder Marsh (/)
 * Mogg Hollows (/)
 * Vec Townships (/)
 * Cloudcrest Lake (/)
 * Waterveil Cavern (/)
 * Lantern-Lit Graveyard (/)
 * Pinecrest Ridge</c> (/)
 * Tranquil Garden</c> (/)

Ice Age depletion lands
The depletion lands from Ice Age work essentially like slow lands, but with the potential to influence the drawback by adding or removing depletion counters. They are allied-colored as well.