I started up a new priest team on grim batol, it's actually quite fun! even at level 10 I had a flawless victory in WSG.

Setup as disc, currently keep shield alive and dot everything and cast penance on CD.

If you try to use shield whilst on CD, it will put it ready for you to click shield a target - this can prevent you using other attacks so I am using this macro

/cast [@player] power word: shield
/cast flash heal

The flash heal gets rid of the power word: shield target cursor .. and heals you or your target if you spam it.

I've got 5 x psyfiend on round robin, doesn't seem to have any effect on stealthed targets though.