So far, I've seen Benedictus in a couple hilarious decks on Reddit that involved Hemet:
1) A complete steal your deck style deck: nothing above 3, then you get to play their deck!
2) Benedictus, Hemet, DK Anduin, (maybe Raza). Hemet your deck away to guarantee a draw into DK Anduin/Benedictus. DK Anduin, then use Benedictus to grab their deck to fuel your pew pew with the new hero power.
Mostly a reddit theory, take that as it may. Priest is frustrating because they steal your cards then beat you with your own cards. I remember Drakonid Operative being hated so much when it came out.