Well, there's always this..
1. Martial Wizard 1: Improved Initiative, [Any metamagic feat]
2. Human Paragon 1:
3. Human Paragon 2: Iron Will, Sanctum Spell (Needed to qualify for spellshaper early on, retrain out of this, or darksunshuffle.)
4. Metaphysical Spellshaper 1:
5. Metaphysical Spellshaper 2: [Any metamagic feat]
6. Metaphysical Spellshaper 3: [Any feat]
7. Incantatrix 1: [Any metamagic feat]
8. Incantatrix 2:
9. Incantatrix 3: [Any feat]
10.Incantatrix 4: [Any metamagic feat]
11.Incantatrix 5:
12.Incantatrix 6: [Any feat]
13.Incantatrix 7: [Any metamagic feat]
14.Incantatrix 8:
15.Incantatrix 9: [Any feat]
16.Incantatrix 10: [Any metamagic feat]
17.Human Paragon 3:
18.Magical Trickster 1: [Any feat]
19.Magical Trickster 2: [Any metamagic feat]
20.Magical Trickster 3:
Basically your power level will be maximum, you apply metamagics at the fly by taking ability damage, persist each and every spell in existence and reduce the spell level adjustments by 2. Then you go for Arcane Thesis: Ray of stupidity, apply Twin, Maximize, Empower, Split Ray. That'll be level 3 spell for you, afaik. (-1 Empower, -1 Split, +1 maximize, +2 Twin.). 24+2d6 int damage as ranged touch. Do that in spell duels, target loses.