Reshape

Tinker's careful sibling, built to do the same broken thing with the brakes attached. Where Tinker let three mana turn any artifact into the single biggest thing in your library, this version caps the search at the converted mana cost you actually paid into X, so the artifact you find sits on the scale you funded. That single constraint accounts for the wildly different lives the two led: Tinker became one of the most-banned cards in the game, while this one mostly stayed legal, asking you to pay full freight for whatever you tutor onto the battlefield. The shape is a transmutation engine: trade an artifact you have for an artifact you want, at sorcery speed, with the new piece arriving in play rather than your hand. The natural line is sacrificing something cheap and disposable (a mana rock, a token-producing trinket, a body that already did its job) to fetch a specific high-impact artifact, or to dig out a combo piece whose cost you can afford to pour X into. It rewards a deck that treats artifacts as fungible fuel rather than fixed permanents, where every cog on the board doubles as a tutor target waiting to be cashed in.