Crested Sunmare is a mythic Creature — Horse card from Hour of Devastation Promos (PHOU), collector number 6s. Current market price: — (foil $25.17), TCGplayer market prices via Scryfall.
Other Horses you control have indestructible. At the beginning of each end step, if you gained life this turn, create a 5/5 white Horse creature token.