Chromatic Orrery

The trick isn't the mana ramp, though five colorless plus color-fixing off a single tap is real acceleration; it's that the fixing clause and the payoff clause are pointed at the same statistic. Spending mana as though it were any color quietly nudges you toward permanents of many colors, and the draw ability then pays out precisely for that spread: a card per color represented on your board. Most colorless rocks that fix mana are agnostic about what you cast; this one wants you loud and rainbow, because a two-color battlefield draws two and a five-color battlefield draws five. That coupling is the whole design. It solves the perennial problem of the artifact ramp piece that fixes for everything but rewards nothing: here the reward scales with the diversity the fixing enables, so the card is self-referential in a way that flat mana rocks are not. The seven up front is steep and the draw ability costs a further five to fire, a two-step ceiling that keeps a five-card refuel from arriving too cheaply; it demands a board already committed to breadth before it pays out. What it represents is the wide-mana artifact as a deckbuilding thesis rather than a fixing convenience: a rock that asks how many colors you can honestly claim, and hands you cards in proportion to the answer.