Extractor Demon is a rare Creature — Demon card from Commander 2015 (C15), collector number 124. Current market price: $0.32, TCGplayer market prices via Scryfall.
Flying Whenever another creature leaves the battlefield, you may have target player mill two cards. 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.)