Void Relic

{t}: Add one mana of any color that a land an opponent controls could produce.

They say the contents of a Relic are simultaneously this thing, or this thing, or this thing, but also that thing and certainly never just one thing.
That is until it's exposed to a Void Fissure? And at that point, all the possibilities collapse, each one falling away until the Relic cracks open and exposes one, singular thing.