WizarDru
Adventurer
KaeYoss said:
Quicken Spell will not work!
Quicken Spell will enable you to cast the spell as a free action, not as a reaction. You can only take free actions on your turn.
I think you're right, but the SRD is a tad vague. Particularly since Speaking is a free action, as is dropping your weapon. However, reading it, I think it's pretty clear that you can't cast a counterspell unless you've readied an action to specifically do it.
Free Action: A character can perform one or more free actions while taking another action normally. However, the DM puts reasonable limits on what a character can really do for free.