Daretti, Rocketeer Engineer is a rare Legendary Creature — Goblin Artificer card from Aetherdrift Promos (PDFT), collector number 120p. Current market price: $0.19 (foil $0.30), TCGplayer market prices via Scryfall.
Daretti's power is equal to the greatest mana value among artifacts you control. Whenever Daretti enters or attacks, choose target artifact card in your graveyard. You may sacrifice an artifact. If you do, return the chosen card to the battlefield.