[Shujin]

I would suggest starting from the top, with the most unfair mechanics.

Currently these are in my Opinion:
-Double turning after Summoner Death
-Fire/Wind Elementals/yukionna reflect, cause they counter counterplay
-Dimension Resonance

Maybe cut down on some of the autohits, or limit them to atleast once a turn, primarly I would look at Whirlpool and Suzaku for this.

Those changes alone would suddenly make it feel a lot more fair and allow counterplay. GS would still remain a good class too.