Sai, Master Thopterist is a rare Legendary Creature — Human Artificer card from Commander Masters (CMM), collector number 118. Current market price: $0.61 (foil $1.83), TCGplayer market prices via Scryfall.
Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying. {1}{U}, Sacrifice two artifacts: Draw a card.