Thriving Skyclaw is a common Creature — Cat Dragon card from Modern Horizons 3 (MH3), collector number 141. Current market price: $0.16 (foil $0.21), TCGplayer market prices via Scryfall.
Flying When this creature enters, you get {E}{E}{E} (three energy counters). Whenever this creature attacks, you may pay {E}{E}{E}. If you do, put a +1/+1 counter on it.