Dragonhawk, Fate's Tempest is a mythic Legendary Creature — Bird Dragon card from Bloomburrow Promos (PBLB), collector number 132p. Current market price: $4.96 (foil $8.01), TCGplayer market prices via Scryfall.
Flying Whenever Dragonhawk enters or attacks, exile the top X cards of your library, where X is the number of creatures you control with power 4 or greater. You may play those cards until your next end step. At the beginning of your next end step, Dragonhawk deals 2 damage to each opponent for each of those cards that are still exiled.