Ruby Medallion

One member of the Medallion cycle, the artifact set that quietly redefined how much a single color could lean on a cost reducer. The trick of the design is its breadth: it does not narrow to creatures, to instants, or to a spell type, but to color, which means every red card in the deck gets cheaper the moment you cast it. That makes the rate scale with consistency rather than with a particular slot. A burn-and-aggro shell that floods its list with red spells turns the discount into compounding tempo across a whole turn's worth of casts. The discipline is precise: it only shaves a single generic mana, so the colored requirement always survives. A one-mana burn spell that costs gets nothing, because there is no generic in the cost to remove; the Medallion rewards spells that carry generic in their mana cost, but the reduction is a flat one each, never more. That is the structural floor the design needs: it cannot drive anything to free, only accelerate it toward its colored core. It is also color-locked in a way that punishes greedy multicolor builds: pay two mana for an artifact that does nothing unless your deck is committed to red. That single-color tax is the cost of admission. The Medallions reward purity, and the more monochromatic the deck, the more the rock pays you back.