Chronomancer is a rare Artifact Creature — Necron Wizard card from Warhammer 40,000 Commander (40K), collector number 32★. Current market price: — (foil $5.17), TCGplayer market prices via Scryfall.
Flying Atomic Transmutation — {1}, {T}, Sacrifice another artifact: Draw a card. Unearth {2}{B} ({2}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)