Cogworker's Puzzleknot

Two mana buys a Servo now and stores a second one behind a mana-and-color gate, and that staggered delivery is the whole reason to run the card. The token that enters immediately is unremarkable filler; the design lives in the artifact that stays on the battlefield afterward, sitting on the table as a token held in reserve until you have the and a reason to cash it in. That second Servo is sacrifice fodder on demand, a chump blocker for exactly the turn you need one, or a body to feed an outlet at the precise instant it matters, rather than a commitment you made up front. The deeper return is trigger count. A sacrifice or aristocrats engine cares less about the raw 1/1s than about the moments they generate: a creature entering when the artifact enters, and later both a creature entering and an artifact leaving when you sacrifice the whole thing for the second token. One card spread across two turns manufactures several of those instants. The on the activation is what keeps the reserved token honest: gating it behind a color commitment and a real mana payment means the second body competes with the rest of your turn instead of arriving free. Filler by stat line, a quiet enabler by construction, and precisely the kind of low-value glue a token-fueled engine is built to convert into something larger.