Naked Singularity
Scramble the five basic lands and watch the color pie fold over on itself: Plains start making red, Islands make green, Swamps make white, Mountains make blue, Forests make black. Nothing in the game before or since has rearranged mana production this aggressively, and the mapping is built as a one-step rotation rather than anything you would actually want, which means it can never serve as clean fixing. You either run the "wrong" basics on purpose or accept that your existing lands now lie to you about what they tap for. The compounding upkeep is what stops it from being a free color filter: the maintenance climbs by another 
every turn it survives, so it rewards a single burst of off-color mana and then wants to die, not anchor a manabase. This is Ice Age's house style distilled: artifacts and enchantments saddled with steep cumulative-upkeep costs that punish you for keeping a good thing on the table too long. The result reads less like a tool than a question, namely whether the color pie can be inverted at all, and the card's quiet answer is yes, but the price grows steeper every turn you insist on the trick.
Rules text
(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.)
If tapped for mana, Plains produce 
, Islands produce 
, Swamps produce 
, Mountains produce 
, and Forests produce 
instead of any other type.