Arcum Dagsson is a rare Legendary Creature — Human Artificer card from Coldsnap (CSP), collector number 27. Current market price: $16.53 (foil $95.57), 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.