Harried Dronesmith is a uncommon Creature — Human Artificer card from Murders at Karlov Manor (MKM), collector number 131. Current market price: $0.18 (foil $0.30), TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, create a 1/1 colorless Thopter artifact creature token with flying. It gains haste until end of turn. Sacrifice it at the beginning of your next end step.