Prismatic Geoscope

The five-color rock that scales with the work you have already done. Most fixing artifacts in this tradition pay a flat dividend: a single tap for any color, or Chromatic Lantern's one-of-any-color per tap. This one ties its output to domain, so a board holding all five basic land types turns one tap into five mana spread across whatever colors you need. The five-mana price and the tapped entry are the brakes: it sits inert once resolved, offering nothing until you untap, and reaching full output requires a manabase already running every basic type, which is its own deckbuilding cost. That makes it a payoff for greedy five-color manabases rather than a fixer that fixes greed: it rewards a board you had to assemble, then doubles down on it by pouring out the volume of mixed mana only a domain-maxed deck can reach. Note the ceiling moves with whatever counts your land types, so anything that grants a single land multiple basic types pushes X higher than the count of distinct lands suggests: a Triome or a dual with two basic types each contribute their full share to domain. It is a ramp piece wearing the costume of a fixer, and the better your colors already are, the more it heaps on top.