Power Plant Worker is a common Artifact Creature — Assembly-Worker card from The Brothers' War (BRO), collector number 241. Current market price: $0.20 (foil $0.22), TCGplayer market prices via Scryfall.
{3}: This creature gets +2/+2 until end of turn. If you control creatures named Mine Worker and Tower Worker, put two +1/+1 counters on this creature instead. Activate only once each turn.