Storm Raven said:Except that to use Divine Metamagic with Persistent Spell requires the cleric to burn 7 turn/rebuke attempts. For most clerics, even with the Extra Turning feat, that's most, if not all, of their turn/rebuke attempts for the day. To me, that seems like a significant investment on the part of the cleric, essentially tantamount to giving up the turn/rebuke ability for the day.
I believe that extra turning can be taken multiple times. A cleric with an enhanced CHA of 16 and the follwoing feats: extend spell, persistent spell, divine metamagic (presistent), extra turning (x3) will have 18 turn attempts per day. That allows 2 persistent spells (divine power comes immediately to mind) plus 4 tuern attempts for undead.
It does strip the cleric somewhat bare of feats.
This was a much bigger deal pre-errata when this was a 4 feat combination and not a 6 feat one!