Priring is your best bet. As a magic user, your accuracy will be lacking since you can't stack it on gloves and you may not be able to get it on a weapon either. Not to mention every hit counts as a magic user. Half the time, a constant hit rate could be the only thing keeping you from dying... Especially if you lag. If you use wind, water, or evil sound - hitting isn't AS important as dealing damage (since the cool down is very low). In that case...
Gumiho is nice if you don't have a lot of crit damage. Your crit should be 70% at the lowest, which equals out to 100% after the base is factored in. So if your glove, armor set and misc skills aren't cutting it, a Gumiho would be useful to have.
"He who fights and runs away, lives to fight another day!"