I don't currently have time to read all other comments, so excuse me if I repeat some points.
Naked slann is an interesting choice. I like your tendency of keeping characters cheap but it think there are some good investments possible for upgrades. One of those is the channeling combo, channeling staff plus the mastery that lets you channel thrice is very point efficient, netting you both a PD and DD on average every turn. Soul of Stone is also very strong, you would be surprised how much +1/-1 on miscasts matter. Also don't forget you can make your Slann the BSB in conjunction with him being the general for only 25 points, it is really strong.
Your scarvet is also cheap. Consider investing a few more points in the Armor of Destiny for a 1+/4++, or the Gamblers armor plus the Dawnstone for 1+ rerollable plus 6++, it makes him so much more durable than what you have now for only a few more points.
I would consider dropping the Razor standard in lieu of some more TG. People will want to kill your big magical frog, so bring enough TG to protect him. I would also drop the cold one knights. It might seem strange, but your scarvet with 1+ rerollable or 1+/4++ can run solo, most shooting and magic missiles will bounce of him. Be wary of bolt throwers and canons though, but as you have a lot of monsters, giving them another target won't be that bad, as their shots will hurt already. The single cav model is also generally easy to hide.
I am also interested why you are taking 5 chameleons twice instead of 10 skink skirmishers. When warmachine hunting, normal skirmishers are often quite as strong as chameleons against good opponents, as 24 inch threat range from normal skirmishers is often good enough, and a good opponents will deny you strong scouting opportunities. Another benefit is that skirmishers are core, even though that does not matter much for your list. I like to take the 9th age as an example how strong skink skirmishers are, they more than doubled on point costs in that updated version of the game, and you are only allowed to take a limited amount of them, and they are still strong.