P.10.1- This phase is called the "Postcombat Main Phase". [CompRules 1999/11/01]
P.10.Ruling.1- If a spell or ability gives you additional main phases in your turn, they will all be 'postcombat' main phases. [DeLaney 2000/01/13] For example, Relentless Assault.
Note- See First Main Phase for rules.
Note- Remember to check for mana burn at the end of the phase. See Rule P.3.5.