Board Thread:Naruto Discussions/@comment-34436445-20180627113230/@comment-734582-20180627154739

Ninja Of War wrote: An honorable mention would be for Kamui in particular. If you die, you can use kamui to come back to the world of the living, posses someone and let them use your abilities. Pure plot no jutsu. Kamui can be used to traverse dimensions. The afterlife is a dimension. So, Kamui can also access that. Summoning also works, after all. In fact, what you described is basically how Edo Tensei works.

Ninja Of War wrote: Sharingan, it unlocks potential for genjutsu, taijutsu and ninjutsu without the user having to earn it. Basically, yea. Sharingan unlocks probably the most power for the least effort.