Steelswarm Operator

Blue does not get to make mana; the color's identity resists ramp, so any acceleration handed to it has to be fenced off from the rest of the game. The fence here is a hard restriction: both tap abilities produce mana that can only feed artifacts, one blue for casting an artifact spell and two blue for firing an artifact's activated abilities. That seal is the whole reason the rate is safe. A two-mana flier that tapped for one or two free mana would warp any deck that could spend it, but this robot can only ever pour its output back into a metal shell, so it accelerates an artifact deck without doing anything at all outside one. The split between the two modes is the smart part: you choose based on whether you are deploying a new artifact or paying to activate one already on the table, and the double-blue mode specifically targets the expensive activated abilities that artifact decks otherwise struggle to fund. The 1/1 flying body is nearly beside the point, though it chips in a point of evasion and, being an artifact itself, counts toward whatever artifact-count and affinity payoffs surround it. This is a single-job piece, sized so it can only do that job and priced to come down early as an enabler rather than a threat.