Workshop Elders is a rare Creature — Human Artificer card from March of the Machine Commander (MOC), collector number 245. Current market price: $0.29, TCGplayer market prices via Scryfall.
Artifact creatures you control have flying. At the beginning of combat on your turn, you may have target noncreature artifact you control become a 0/0 artifact creature. If you do, put four +1/+1 counters on it.