Elven Chorus is a rare Enchantment card from Tales of Middle-earth Promos (PLTR), collector number 160s. Current market price: — (foil $7.26), TCGplayer market prices via Scryfall.
You may look at the top card of your library any time. You may cast creature spells from the top of your library. Creatures you control have "{T}: Add one mana of any color."