Sly Requisitioner is a uncommon Creature — Human Artificer card from Aether Revolt (AER), collector number 72. Current market price: $0.10 (foil $0.84), TCGplayer market prices via Scryfall.
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Whenever a nontoken artifact you control is put into a graveyard from the battlefield, create a 1/1 colorless Servo artifact creature token.