Memnarch is a rare Legendary Artifact Creature — Wizard card from Darksteel (DST), collector number 129. Current market price: $5.21 (foil $70.92), TCGplayer market prices via Scryfall.
{1}{U}{U}: Target permanent becomes an artifact in addition to its other types. (This effect lasts indefinitely.) {3}{U}: Gain control of target artifact. (This effect lasts indefinitely.)