Gishath, Sun's Avatar is a mythic Legendary Creature — Dinosaur Avatar card from Secret Lair Drop (SLD), collector number 320. Current market price: $37.45, TCGplayer market prices via Scryfall.
Vigilance, trample, haste Whenever Gishath deals combat damage to a player, reveal that many cards from the top of your library. Put any number of Dinosaur creature cards from among them onto the battlefield and the rest on the bottom of your library in a random order.