Riptide Replicator

Pay X once at cast, then keep paying it back forever: the charge counters lock in a token size that never decays, so the body you choose on turn six is the body you mint on turn fifteen. That permanence is the whole conceit here. Most token engines scale with the board or the turn count; this one front-loads the investment into a single number and then sells you copies of that number on demand, at four mana plus a tap, indefinitely. The color and creature-type choices made on entry are equally locked, which turns the artifact into a slow tribal payoff: a Goblin deck commits to Goblins, an Elf deck to Elves, and the replicator becomes a renewable source of the chosen kind. The math rewards patience over greed. Spend a small X and you get a faster, cheaper stream of modest bodies; sink everything into a huge X and each activation is a haymaker that costs the same to recur as the cheap version. It is a colorless mana sink wearing tribal clothing, the kind of artifact built for grindy, no-rush environments where a single uncontested engine eventually buries the opponent under identical creatures. The Onslaught block leaned hard on creature types, and this is that theme rendered as a manufacturing line: pick your species, set your dial, and produce one perfect specimen at a time until the game ends.