With max aspd and 3 kiels the skill is highly spammable. Also weapon swapping is a very essential part of PvP for many classes. This includes high wizards. I completely disagree that Highwizards cant kill people unless they are afk or out of yggs. If someone doesn't wear GTB you can 1-2 shot them with storm gust or stunlock them with skills that do massive damage, using the right gears that is. Once someone uses gtb your stave crasher can easily reach up to 25k+ and with it's spam rate it has quite some high damage output.
I'd recommend you using 2 wiz highness. Wiz highness on itself already helps a lot with your damage. Card one with 4 kingrings for your normal magic dmg output. Card one with incant, phree and double turtle general for stave crasher. If you can't afford 2 weapons use incant, phreeoni double kingring for an all-around weapon. That + double fbh and int belts can reach your stave crasher to 20k+ easily. Which is some fine damage if you ask me.