Goblin Engineer is a rare Creature — Goblin Artificer card from Secret Lair Drop (SLD), collector number 2103. Current market price: $15.69, 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.