Inspiring Statuary is a rare Artifact card from Aether Revolt Promos (PAER), collector number 160s. Current market price: — (foil $1.59), TCGplayer market prices via Scryfall.
Nonartifact spells you cast have improvise. (Your artifacts can help cast those spells. Each artifact you tap after you're done activating mana abilities pays for {1}.)