Hellkite Charger is a rare Creature — Dragon card from Zendikar (ZEN), collector number 131. Current market price: $3.98 (foil $5.26), TCGplayer market prices via Scryfall.
Flying, haste Whenever this creature attacks, you may pay {5}{R}{R}. If you do, untap all attacking creatures and after this phase, there is an additional combat phase.