
The fact that, whenever a spell is cast, you need to shout its name only provides a +5 bonus.
Jane: Captain Obvious apparently can't cast any spells that aren't entirely obvious. We should be able to escape pretty easily. I saw a window just down here-
Captain Obvious: HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA
Captain Obvious: As you can tell from the lantern hovering above my head which has a goatee which is evil and yellow, I have figured out how to defeat you! I have a cape which is red and says CO on it!
Jane: Good for you. Taking 10 on Listen checks seems to work!
Captain Obvious: I am holding a wooden sign. It is made of wood. There is writing on the sign.
Sign reads: Destruction is the magic spell I am casting, which is a magic spell and is magical.
Captain Obvious: Destruction is the magic spell I am casting, which is a magic spell and is magical!
Same sign visible.
Jane: Counterspell.
Captain Obvious: Disintegrate is the magic spell I am casting, which is a magic spell and is magical!
Sign reads: Disintegrate is the magic spell I am casting, which is a magic spell and is magical.
Jane: Counterspell.
Captain Obvious: Enervation is the magic spell I am casting, which is a magic spell and is magical!
Sign reads: Enervation is the magic spell I am casting, which is a magic spell and is magical.
Jane: Counterspell.
Captain Obvious: Meteor Swarm is the magic spell I am casting, which is a magic spell and is magical!
Sign reads: Meteor Swarm is the magic spell I am casting, which is a magic spell and is magical.
Jane: Counterspell.
Captain Obvious: How can you tell so consistently which spell I'm casting? Surely you'll roll a natural 1 on Spellcraft eventually!
Jane: Holding up the spell's name on a big sign provides a +20 bonus, believe it or not.
seriously though....