Level adjustment buy-off in effect? Then this is piece of cake:
Divine Minion 1 (bought off)/Soulknife 2/Beholder Mage 3/Incantatrix 1/Lurk 1.
You'll need to use Aberrant wild shape from Lord of Madness, you also needs assume supernatural ability, which you will retrain into the better metamorphic transfer at level 6 where you grab practiced manifest. If this isn't allowed, you will need 6 levels of Master of Many forms, and would be better of being an Ur-Priest.
Ok, so the build goes as follows: You cast about as well as an 8th level wizard, but you shore up a bunch of weird abilities from your other classes, making you able to do a bunch of weird stuff.
Alternatively:
Ghost Savage Progression 2 (bought off)/Soulknife 2/Lurk 2/Whatever you fancy 3 (probably soulbow). Your race is probably grey elf, but other kinds of elves are fine too. You are indesribably old, (so +3 to all physical stats), and you are of course a faerie mystery initiate. Your ghost was created in a desecrated zone by some dude with the Corpse Crafter feat. You put your highest stat in int (assuming it is an 18), you will be having D12+9HP per level. As well as being incorporeal. Your main attack will be telekinesis, but you will do all that jazz with black lotus covered stuff that you picked up with hidden talent.
You could take all 4 levels of the ghost savage progression.
If you really want to be the main line fighter, you could do something with a Half-minotaur so you will at least have huge stats, then you don't need to worry that much about BAB.