I don't see the point to learn:
Kami's Desire: 100% chance to remove a buff: if u remove the buff, the oponent will rebuff :S
Kami's Will: Why I need to resurrect? Edit: For pvp in group, right
Kami's Assistance: Restore 100RP and cure paralysis: Not bad, but I think is prefer to save that skill point for another skill...
Kami's Light: Increase Max EP by 235 and regenerarion EP 6: Same as Kami's Assistance
Kaioken: I have some doubts about this... to drain EP and LP shouldn't be good... is right I can heal myselft but... I dont think so..
Kaioken + speed gear = high damage (with +8 lvl55-60 staff).
RP is needed in ranked,budokais so if u get 1st RP u have a pretty big advantage here. KD spam is possible too.
Against healers & other poko's or ultimates its good to remove their buffs one by one.
Removing debuffs ... u will lose in seconds if u don't have that skill.
Having both of the heal overtime skills maxed is a good idea too.