Dragonlord Atarka is a mythic Legendary Creature — Elder Dragon card from Dragons of Tarkir (DTK), collector number 216. Current market price: $2.23 (foil $16.15), TCGplayer market prices via Scryfall.
Flying, trample When Dragonlord Atarka enters, it deals 5 damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control.