Arcbound Worker is a common Artifact Creature — Construct card from Modern Masters (MMA), collector number 201. Current market price: $0.30 (foil $0.67), TCGplayer market prices via Scryfall.
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)