Slobad, Iron Goblin is a rare Legendary Creature — Phyrexian Goblin Artificer card from Phyrexia: All Will Be One Promos (PONE), collector number 149p. Current market price: $0.28 (foil $0.38), TCGplayer market prices via Scryfall.
{T}, Sacrifice an artifact: Add an amount of {R} equal to the sacrificed artifact's mana value. Spend this mana only to cast artifact spells or activate abilities of artifacts.