Whispers of the Muse is a special Instant card from Time Spiral Timeshifted (TSB), collector number 35. Current market price: $0.41 (foil $17.35), TCGplayer market prices via Scryfall.
Buyback {5} (You may pay an additional {5} as you cast this spell. If you do, put this card into your hand as it resolves.) Draw a card.