Hellkite Charger 
Creature — Dragon
Flying, haste
Whenever this creature attacks, you may pay 
. If you do, untap all attacking creatures and after this phase, there is an additional combat phase.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL