Splitting the Powerstone

Ramp built on the mechanics of loss. The Powerstone tokens it makes are deliberately hobbled mana: colorless, and unspendable on nonartifact spells, which aims the whole spell at artifact-heavy shells rather than at generic acceleration. The real design idea is the sacrifice requirement doing double duty. You are spending a card and an artifact to get two constrained mana producers, so the spell rewards decks already flush with cheap or expendable artifacts (Treasures, Clues, spent Equipment, tokens) and punishes decks that would have to feed it something they wanted to keep. Sacrifice a token and the artifact side of the trade is free: you are only out the spell itself, and two producers arrive tapped. The legendary rider is the elegant part. Sacrificing a legendary artifact draws a card, which turns the exchange into card parity rather than a net loss: a used-up legendary (a tapped-out mana rock, a spent one-shot, a marquee piece that has already done its job) is recovered at a one-for-one instead of costing you outright. That clause quietly rewards a specific texture of deck, one running enough legendary artifacts to make the draw live without leaning on it. What you are left with is a ramp piece that only makes sense inside an artifact economy, where the input is cheap and the output is exactly the kind of mana that feeds back into that same economy. It is narrow by construction, and the narrowness is the point.