Rarity is a mythic Legendary Creature — Unicorn card from Ponies: The Galloping (PTG), collector number 3. Current market price: — (foil $108.41), TCGplayer market prices via Scryfall.
Rare and mythic rare spells you cast cost {1} less to cast. {1}, {T}, Reveal a My Little Pony® toy you own: Until end of turn, another target creature gains protection from each color in that toy's coat, mane, and outfit.