Leaden Myr

The black member of a five-Myr cycle, each producing one color of mana on a 1/1 artifact body, and it sits in the oddest spot of the five. Black has never wanted for mana acceleration the way the other colors sometimes do, between Dark Ritual, the rituals that followed it, and a long line of swamp-fetchers. So what this brings is not the mana; it is the chassis. A Myr is a permanent that ramps, blocks, and counts toward affinity, metalcraft, and every "artifacts you control" payoff the era and its successors printed. The 1/1 body is the tax: a real ritual-style burst would cost less or accelerate harder, but this thing sticks around, taps every turn, and feeds machinery that does not care what color the mana was. That permanence is the whole tradeoff. It is slower than a one-shot ritual and easier to kill than the rock-only fixing that came later, since the type line reads Artifact Creature and answers both creature removal and artifact removal. But it carries a creature type and an artifact type at once, which is the exact seam the cycle was built to exploit. As fixing it is unremarkable; as a body that happens to make black mana, it has held a quiet slot in artifact-matters builds for two decades.