Thundermane Dragon is a rare Creature — Dragon card from Tarkir: Dragonstorm Commander (TDC), collector number 78. Current market price: $3.39, TCGplayer market prices via Scryfall.
Flying You may look at the top card of your library any time. You may cast creature spells with power 4 or greater from the top of your library. If you cast a creature spell this way, it gains haste until end of turn.