Most of the online posts I find discuss how a Mystic Theurge is not a powerful option as it limits one to the 17th caster level. This, however is not true; it limits on to the 19th. (I am playing with a level 20 limit)
Linked here
http://paizo.com/paizo/faq/v5748nruor1fm#v5748eaic9qp1
is the one method which may make it so.
By using either a Drow Noble or Aasimar, (or a few other creatures from the extended list), one can go
Aasimar
1:divine, 9:arcane, 10:Theurge
Other such as the Drow Noble
1:arcane, 9:divine, 10:Theurge
Is this overpowered? It should be; I am doing a player vs. player one-day battle royal. My worst fear is a monk/paladin/gunslinger who does 'enough' damage, targets touch, and has specialized- enchanted- bullets for everything. [There is no cost limit; only a limit on the number of magic items excluding conventional weapons and armor- 2 such items plus 1 per character item slot]
What are my best options? Here are some of my ideas:
Drow Noble:
Oracle 9
Summoner<Synthesist archetype> 1
Aasimar:
Sorcerer<Cross Blooded Red Dragon and Fire Element> 9
Cleric 1
Aasimar:
Wizard 9
Ceric 1
Aasimar:
Witch 9
Paladin 1/Cleric 1
Essentially I need high saves on everything, either massive utility or the ability to massacre everything in one round, and an initiative from the Gods themselves. The MO is to build the most overpowered character possible. I like the idea of Summoner 1 (11 after 10 levels of Mystic Theurge) because it means I can give my character great physical and mental stats, a fantastic AC, flight, and some powerful level 9 spells from any divine class. Unfortunately to avoid banishment, I would have to give up teleport for dimensional shackles. As to the divine class I am uncertain. There are many options. Storm of Vengeance is one of the nicer looking ones. There are also items to consider; further limitations include no contingency spells prepared ahead of time, spells and potions prior to battle are limited to 5 total(3 spells/2 potions etcetera)-none which take longer than a minute to preform, everyone starts near each other and have a 250 foot radius from thence in which to maneuver.
