Cogwork Assembler

Seven mana to copy any artifact you can target, and only until the next end step: the activated cost is the entire conversation here. That is a punishing rate for a repeatable ability, and it draws a hard line around who benefits. Aim it at a cheap utility artifact and you have overpaid spectacularly; aim it at something whose enters-the-battlefield trigger or activated ability dwarfs the cost, and the haste-and-exile clause stops being a drawback and starts reading as a feature, because you only ever wanted the token for one trigger or one swing anyway. The temporary copy sidesteps the usual problem with cloning expensive bombs: you do not have to keep paying to keep them, you rent the effect and let the end step take it back. The 2/3 body is incidental, a place to park the engine until you have enough mana floating to make the activation matter. What holds it in check is that seven mana is rarely available alongside a board worth copying, so the whole card leans on a mana-rich, artifact-dense shell where the arithmetic finally tips in your favor. Outside that environment it is slow and fragile, an engine with nothing to power, which is why it has stayed a build-around curiosity rather than a staple.