The problems with these stat dependant jutsues is that it forces people into certain stats, what if I want to be a full str/dex/wisdom?
In this manner, I can't unless I want to restrict myself to 2 jutsues. Also, most people wont get to experience most jutsues unless they spread their stats, which may cause them to lose in events, since if you have 30 points to spend, and you spend 6 points in each stat, you would lose on events which require 10 of a certain stat, causing you to lose on all events.
My suggestion is to A. make stat specific jutsues, for example a jutsu which requires only str, dex, etc. and B. make it so that the requirements change on each DK or something similar.