Shuri's Fabricator

Two artifacts stapled into one shell: a pair of restricted mana sources on entry and a repeatable reanimation engine that never leaves the board. The Vibranium tokens are the tell. Walling their mana off from nonartifact spells defuses the obvious abuse (this will not fuel a storm turn or ramp into a nonartifact bomb) and quietly declares what deck this belongs to: one where the board is mostly metal, so the restriction stops being a restriction at all. Four mana for two tapped, artifact-restricted rocks is a real investment, not a freeroll, and delivering them tapped means the acceleration lands a turn late by design; the payoff is that everything you build around it wants exactly the mana it produces.

The reanimation half is where the accounting gets careful. Six mana and a tap to pull an artifact back is a heavy price, and the sorcery-speed clause slows it further, but the ability stays online turn after turn: the Fabricator is a machine, not a one-shot spell. What the finality counter governs is the target, not the engine. It caps each recurred artifact at a single return, exiling it if it dies again, which forecloses the loop where one artifact bounces between graveyard and battlefield forever. That single restriction reshapes the whole thing into a toolbox, rewarding a yard stocked with distinct high-impact artifacts you can march back one at a time rather than a single target to abuse indefinitely.