Lantern-Lit Graveyard

The deal is colorless mana whenever you want it, or one pip of black or red at the cost of a turn's worth of that land. That second mode is the whole design: it offers the fixing a two-color deck needs but charges for it in tempo, leaving the land tapped through your following untap step. The effect is a manabase that bends toward a guild without committing to it, since the colorless option is always there as a fallback when you cannot afford to lose the untap. This puts the card in a lineage of fixing lands that trade speed or life for color access rather than handing it over free; here the currency is the untap step itself, a tax paid in the rhythm of your turns rather than your life total. The slowness is what keeps it off the radar of decks built for speed, and what makes it a quiet, low-cost option for the kind of midrange or control shell that can spare a turn of a single land to smooth its colors.