Slann
-focuse of mystery
-fcoused rumination
skink priest
-lv2
-EotG
-dispell
-rod of the storm
scar-vet
-BSB
-cold one
-shield of mirrored pool
-burning blade of chotec
Very standard and effective character choices. Im not sure about mirroed pool over enchanted shield as getting a 2+ save VS S5 attacks is golden, especially against hydras (which is where the BBoC really shines !) and saurus (which is where I assume he will be) are pretty resilient to magic missles, a smart opponent will just target your skinks who die like flies.
Why is the Slann naked? Bane head is win on a stick on the Slann and cupped hands are great miscast protection. If you're not afraid of miscast (its a pretty small chance of something nasty happeing but when it does its never fun) then at least take bane head, its too good and too underpriced to ignore.
18 Saurus Warriors
-spears, M, S
18 Saurus Warriors
-spears, M, S
18 Saurus Warriors
-spears, M, S
Thats a lot of saurii, 3 fighting blocks + a fighty TG block is probably a bit overkill, you will have trouble deploying them effectivly. Consider dropping one unit for some extra chaff, 2 units of terradons would be an amazing addition to the list and costs about the same.
16 Temple Guards
-Standard
-Sun Standard of Chotec
I don't see the need for the Sun standard. The unit is incredibly resilient to shooting without it, if somebody targets this unit instead of skinks, razordons and the engine you should be VERY happy.
Im not a big fan of razordons, their uses are fairly limited and being forced to take a stand and shoot reaction even when the enemy is too close to allow it makes them a fairly easy target for both shooting and fast moving combat units. I personally prefer salamanders, they have singlehandedly taken out half my opponents army by forced panic tests on numerous occations, but razordons has their uses so I recommend you try both and go with what you like the most.