Electrostatic Pummeler is a rare Artifact Creature — Construct card from Kaladesh Promos (PKLD), collector number 210s. Current market price: — (foil $2.49), TCGplayer market prices via Scryfall.
When this creature enters, you get {E}{E}{E} (three energy counters). Pay {E}{E}{E}: This creature gets +X/+X until end of turn, where X is its power.