Get Rods of Chain Spell, and slap those on any nasty damage-dealer spells you have. Actually, get the other metamagic rods too, for "free" metamagic, lulz, and win (Rods of Extend are a cheap way to increase your buff rotation). It should be well within your 4 MILLION gp budget as a 30th level character.
What is our Wizard's objective, exactly? Some background would help.