This magic rules question is about hellkite charger:
Hellkite Charger
4RR
Creature -- Dragon
5/5
Flying, haste
Whenever Hellkite Charger attacks, you may pay 5RR. If you do, untap all attacking creatures and after this phase, there is an additional combat phase.
In this additional combat phase, can I pay 5RR again for a yet additional combat phase (so there would be 3 combat phases in the turn?) and in that 3rd combat phase can I pay the cost for a 4th combat phase?