Salamander are so strong against Skavens! But with the storm banner you're gonna have to wait for it to stop being effective before moving in position to shoot. One it stops, it's awesome! they are almost all T3, and panic test can be devastating for them!
Skavens have strong magical power, so you have to prepare correctly for it, get Becalming cogitation and a dispell scroll and/or a cube of darkness.
Things that are dangerous are :
-Abomination : deal with it with skinks and magic (Light is good with burning gaze to avoid regen)
-Rat Ogre : Skinks (no armor)
-Plague Furnace w/ monks : Get a Scar Vet w/ heavy weapon and focus the furnace as they will fall to saurus one Furnace is gone.
-Warplightning Canon : Cameleon do the work!