Aether Inspector is a common Creature — Dwarf Artificer card from Aether Revolt (AER), collector number 3. Current market price: $0.06 (foil $0.08), TCGplayer market prices via Scryfall.
Vigilance When this creature enters, you get {E}{E} (two energy counters). Whenever this creature attacks, you may pay {E}{E}. If you do, create a 1/1 colorless Servo artifact creature token.