Damn good fun. One little issue is the mana consumption, which is why i like to use insight on my merc. If you manage to get decent physical damage with strafe, using atma's scarab, you can even use him with prayer, to get that hp boost too. It's something you feel out with experience. Every other monster will die very fast with the piercing freezing arrows.

Its a fun runeword especially with all the frost nova's going off

But even for an Ice Maiden a faith runeword will still deal more damage overall