Sudden Quicken

From: Complete Arcane, page 83

Prerequisite: Quicken Spell, Sudden Empower, Sudden Extend, Sudden Maximize, Sudden Silent, Sudden Still.

Benefit: Once per day, you can apply the effect of the Quicken Spell Feat to any spell you can cast without increasing the spell level of the spell or specially preparing it ahead of time. You can still use the Quicken Spell Feat if you have it.