Must be either Seakin or an Anthropomorphic Bat (Needs Favored Class Druid rather than Any, and these are the only ones that fit the bill without level adjustment, getting high enough Wisdom and Charisma, along with and Intelligence of 14 or of 12 with the human skill bonus.)
Must be Neutral Evil
The DM has to allow the use of the Dragon Magazine Feat “Alternate Source Spell”, and allow it to count for Casting Requirements on Prestige Classes.
If the DM allows the use of otyugh hole to gain Iron Will, then this doesn't require any use of Flaws, though I'd still be tempted to trade Weak Will for Great Fortitude.
Rogue 1 , Bard 1, Druid 1, Rogue 2-3, Bard 2-3, Ur-Priest 1-3, Sublime Chord 1-2, Fochlucan Lyrist 1-7, Unseen Seer 1
Sadly no Psionics, except the use of 2 Open Minded Feats.