Silver Myr

The blue member of a five-strong cycle of metal mana dorks, each tapping for one color. What kept this design alive long past the era that introduced it is the double identity: it is a mana rock that also has a creature type, and both halves do real work. A land-based ramp piece sits inert until you tap it; a Myr can attack, block, carry equipment, count toward an artifact synergy, or trade in combat, all while still producing mana. That second card type is the reason it slots into shells where the color fixing is almost beside the point: anything that rewards you for controlling artifacts gets a permanent that ticks two boxes from one cast. The cost is the honest part of the bargain. Turning two mana into three on the back of a 1/1 is a poor ramp deal on its rate alone, so the body's artifact-ness or its fixing has to pay for the fragility; in a pure ramp list it reads as filler, in an artifact deck it reads as a building block. The cycle has been reprinted across later artifact-themed sets because that flexibility keeps finding homes, but the underlying idea never changed: take the most unremarkable effect in the game, hang it on a creature with a tribe worth caring about, and let the surrounding synergies supply the value the mana ability never could.