I negociated with the DM since my character will be metamagic focused, he allowed that i take metamagic feats from others book! but ONLY metamagic feats, nothing else..
I forgot Craftwand is a prerequiste for be able to use the metamagic spell trigger... i will have to take it.
i would like to keep spellcasting prodigy since my INT is low... and more spells is always good.
Maybe i could drop the Archmage after lvl15, this will free up the 2 spell focus feats.
i could add Craftwand and maybe craft wonderous items.
One question about the metamagic spell trigger ability:
if i understand right... ex: i have a wand of fireball and i want to add quicken spell to it... since fireball is a 3th level spell and quicken is +4 lvl i would have to spend 7 charges to cast one quickened fireball from the wand ? right ?
I tought of bannig either Illision or Necromancy.
Illusion got some good spell like Mirror image or blur and stuff like that but see nothing that amazing from this school.
Necromancy got some good debuff spells but not much.
Chain Spell and Split Ray are not in PGtF. As awesome as they are, by your restrictions you'll probably have to do without.
Take Craft Wand at level 5, move Extend Spell to level 1, nix Spellcasting Prodigy. Spellcasting Prodigy is decent, but Craft Wand is awesome, especially with Metamagic Spell Trigger. That should leave one slot open that must be a Metamagic feat. Widen is a good metamagic to get for free (just not worth 3 levels), and Heighten is good for various shenanigans.
I agree with the "Ban Evocation" sentiment. You can pick up Magic Missile, Scorching Ray, and Fireball before banning it if you like, and you'll still be able to cast them afterwards. Truthfully, those should be the only three pure blasting spells you ever need, and it's really not impossible to make-do without them.
Spell Focus should probably be Illusion and Abjuration, given that Illusions are just plain awesome and Abjuration contains some really powerful spells you should use, despite them having saving throws.
You should bar Enchantment, Necromancy and Evocation if going for three schools. Those are the schools that offer the least variety in spells, and though Enchantment and Necromancy have awesome spells, most of them can be mimicked with Transmutation. And the best Evocation spells can be mimicked with the Illusion and Conjuration school.
Metamagic spell trigger just makes you expend the extra number of charges that the metamagic feat modifies it by. A good old trick is picking up a rod of enervation, and adding Twin, Split and empower to it. While it might seem like a lot to spend 7 charges (4 with 10 levels of incantatrix), it will almost instantly waste anything that is not immune to level drain.
If you are considering which metamagic feats to add, these are the top 5 used by incantatrices (in no particular order):
Extend Spell, Persistent spell (get some items to get an extreme spellcraft check), sculpt spell, chain spell, split ray.
With reach spell (from archmage or from a rod) and chain spell, you can easily target the entire party with your buffs. Good buffs are wraithstrike and the like.
Also, there is this handbook if you need to make sure what spells you need:
http://brilliantgameologists.com/boards/index.php?topic=394.0Also, I don't really get why you want spellcasting prodigy, it rarely adds that much. to get more spells just specialize instead.