Arcum Dagsson is a mythic Legendary Creature — Human Artificer card from Double Masters (2XM), collector number 41. Current market price: $16.37 (foil $32.99), TCGplayer market prices via Scryfall.
{T}: Target artifact creature's controller sacrifices it. That player may search their library for a noncreature artifact card, put it onto the battlefield, then shuffle.