Foundry Assembler

Improvise turned every spare artifact on the battlefield into a partial discount, and this is the keyword's plainest demonstration: a vanilla 3/3 body whose only mechanical job is to show what tapping your board's worth of Servos, Treasure, and leftover equipment actually buys. Because the cost is entirely generic, every one of those taps chips at the whole price, so the five is mostly fiction in any deck built to support it; once you have a couple of artifacts to tap, the assembler arrives early, and with five artifacts to spend it costs nothing at all. That is what the card sells, and it sells it honestly. The trade-off is that improvise pays only generic mana and only with a tap, so the cards you spend are cards you are not attacking or blocking with that turn, and the discount competes directly with the artifacts' other uses. As a body, a 3/3 with no evasion and no abilities is filler the moment it is on the table; the assembler earns its slot entirely on the turn it is cast, as a tempo swing rather than a threat. It is the Assembly-Worker that exists to teach the mechanic by being nothing but the mechanic, the kind of clean common that maps a keyword's ceiling without complicating it.