It's just that he offers so much.
Evasion, revive, ignition (twice in a row with mystery and chase, so it's still 100% chance on genjutsu return), prompt mystery, high combo, ignition on standard attack, and a chase on his own mystery for more damage.

A nerf would be justified, and he is getting nerfed in the future.
BUT, I'm still going to use him with the nerfs. I can make it work. :3