Fra'Aldar Hellkite

Flying, Haste
Whenever Fra'Aldar Hellkite attacks, if it is the first time Fra'Aldar Hellkite has attacked this turn, you may pay {4}{r}. If you do, untap all attacking creatures and there is an additional combat phase after this phase. This ability costs {1} less for each +1/+1 counter on attacking creatures you control.