Dromoka, the Eternal is a rare Legendary Creature — Dragon card from Fate Reforged (FRF), collector number 151. Current market price: $0.34 (foil $2.32), TCGplayer market prices via Scryfall.
Flying Whenever a Dragon you control attacks, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.)