The beastmen are an army lizzies can really dominate in small games. They have virtually no armour save, next to nothing in terms of shooting and comparatively poor leadership. However, they can be fast moving and do have a number of monstrous beasts, chariots and bigger monster that can really put a beating on lizzie infantry. I would suggest a mounted scar vet with re-roll of the armour save as general and lots of skinks and skink cohorts. Depending on the size, a block of saurus can form a very tough anvil as well.