Dragonhawk, Fate's Tempest is a mythic Legendary Creature — Bird Dragon card from Bloomburrow (BLB), collector number 132. Current market price: $3.94 (foil $5.87), 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.