Digsite Engineer is a rare Creature — Dwarf Artificer card from The Brothers' War Commander (BRC), collector number 71. Current market price: $0.72, TCGplayer market prices via Scryfall.
Whenever you cast an artifact spell, you may pay {2}. If you do, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."