Terror of the Peaks is a mythic Creature — Dragon card from Outlaws of Thunder Junction Promos (POTJ), collector number 149p. Current market price: $32.25 (foil $32.68), TCGplayer market prices via Scryfall.
Flying Spells your opponents cast that target this creature cost an additional 3 life to cast. Whenever another creature you control enters, this creature deals damage equal to that creature's power to any target.