Aether Inspector

The energy here arrives in a tidy bundle: two counters on the way in, two counters spent per attack to spit out a Servo. That symmetry makes the card a self-contained battery for exactly one extra body, and the math is the whole point of the limit. Vigilance is what turns the loop into something better than break-even: the Inspector swings, banks no risk to its blocking duty, and converts its starting energy into a creature on the first attack. After that initial trigger, it needs energy from elsewhere to keep going, so it sits at the intersection of a standalone value creature and a payoff for a deck already pooling counters. As a piece of the energy archetype that ran on Aether Hub and the broader counter economy, it represents the most modest tier of that design: a common-feeling rate creature that pays you once for free and rewards you again if your deck builds the reservoir to feed it. The Servo it makes is mechanically relevant too, since artifact tokens feed improvise, fabricate's cousins, and the various aristocrat outlets that care about disposable bodies. On its own it is a fair four-drop with a defensive posture; inside an energy shell it is a steady token engine that asks nothing of your mana to operate.