Transmute Artifact

Tinker's older sibling, and the more honest of the two. The design is a tutor with a built-in tax: you pay the difference in mana value between what you sacrifice and what you fetch, which means the card scales from "find a Sol Ring for two mana" to "cheat a Mishra's Workshop-fueled monster into play for whatever you can stomach." That sliding cost is the discipline that keeps the effect from being a flat search-and-put-into-play; the sacrifice clause forces you to convert something already on the battlefield, and the math punishes you for reaching too far up the curve in one cast. What makes the card a touchstone of artifact toolboxes is that it accepts any artifact as fuel and produces any artifact as output, with no type, color, or subtype rider. The conversion rate is the only restriction, and conversion rates are something a deck can engineer: cheap mana rocks in, expensive game-enders out, with the difference paid in the mana the rocks themselves produced. Generations of combo builders have used it as a flexible piece of the chain rather than a finisher, because the sacrifice-and-shuffle structure leaves a trail of triggers and a thinned library behind it. The two blue pips are the soft cap; everything else about the card is open-ended in a way that modern tutors are deliberately not.