I shall help you.
Presenting the...
SACRILEGIOUS FIST!
Human Monk 2 (
Passive Way)/Duskblade 3/Ur Priest2/Sacred Fist 10/Enlightened Fist 3
Feats:
1. Apprentice (Criminal) or
Skill Knowledge (Bluff)
1. Iron Will
1. Combat Expertise (Monk bonus)
2. Improved Trip (Monk bonus)
3. Spell Focus: Evil
4. Combat Casting (Duskblade Bonus)
6. Superior Unarmed Strike
9. Improved Natural Attack
12. Extend Spell
15. Persist Spell
18. Divine Metamagic: Persist Spell
Just refluff Ur Priest as a servant of Mystra who is granted cleric powers by the god, change the Spell Focus: Evil prerequisite to something fitting with Mystra's theme, like Magical Aptitude or Skill Focus: Spellcraft, or Skill Focus: K. Arcana, and you should be good to go.