Goblin Engineer is a special Creature — Goblin Artificer card from Time Spiral Remastered (TSR), collector number 345. Current market price: $9.89 (foil $35.14), TCGplayer market prices via Scryfall.
When this creature enters, you may search your library for an artifact card, put it into your graveyard, then shuffle. {R}, {T}, Sacrifice an artifact: Return target artifact card with mana value 3 or less from your graveyard to the battlefield.