It doesnt produce any mana and it instead gives an ability to every creature on the board that causes them to be destroyed unless the person controlling them keeps paying mana to prevent this from happening
~ Enemy Utility lands: Like Innistrad, Dark Ascension and Avacyn Restored contain (between them) a cycle of colorless lands that can be tapped for one (colourless) mana and have an additional tap ability requiring two specific colors of mana to activate
You can do similar things with Narset, Parter of Veils, but the major problem comes from Leovold being playable as a commander
However, effects like Whispersilk Cloak, Timely Ward, and Spirit Mantle mitigate that well thanks to Myrels static ability, which all but guarantees they wont be blown out by instant-speed removal in response
Basic lands showcase locations throughout the franchise, along with Pip-Boy treatments applied to select cards