Shuri, Wakandan Inventor

Two mana buys a cost reducer with a straight line back to Foundry Inspector and Etherium Sculptor, but the tax break is a footnote to what the second ability actually does. For one mana and a tap, you rewrite one artifact into a copy of another until end of turn, and the clause that strips the legendary supertype is what turns a novelty into an engine. It means you are not just duplicating a Sol Ring; you can point a token or a mana rock at a legendary artifact you already control and get a temporary second one, the full turn's worth of its taps and activations, without the legend rule intervening. The sorcery-speed restriction fences the whole thing in: no end-step surprises, no combat-trick copying, every conversion resolves in one of your main phases with the table watching it form. That timing window still leaves room to read the board, since a post-combat activation can convert an artifact into whatever the turn has revealed you need. Build the copy target correctly and this is a turn-by-turn value loop that manufactures whichever artifact matters most that turn; leave the board thin and you have a 2/1 with a discount attached. The ability rewards a battlefield already stocked with artifacts worth impersonating, which is precisely the kind of engine utility artifacts and premium mana rocks were built to feed.