Princess Twilight Sparkle is a mythic Legendary Creature — Alicorn card from Ponies: The Galloping (PTG), collector number 2. Current market price: — (foil $216.96), TCGplayer market prices via Scryfall.
Flying Other Alicorns, Horses, Pegasi, Ponies, and Unicorns you control get +1/+1. {W}{U}{B}{R}{G}: If you control Applejack, Fluttershy, Pinkie Pie, Rainbow Dash, and Rarity, everypony wins the game.