Goblin Welder is a mythic Creature — Goblin Artificer card from Duel Decks: Elves vs. Inventors (DDU), collector number 35. Current market price: — (foil $22.60), TCGplayer market prices via Scryfall.
{T}: Choose target artifact a player controls and target artifact card in that player's graveyard. If both targets are still legal as this ability resolves, that player simultaneously sacrifices the artifact and returns the artifact card to the battlefield.