Hearthpwn

This should have had 1 more attack and thief priest ain't winning you games now, so this card won't do much either.
I think people will try it first and come to the conclusion there are better options than this card.

Generically good.

The fact its from hand rather than deck is interesting, but I would have liked to have seen a 3/6 stat line (but maybe that's OP - I dunno anymore), as 2 attack will barely contest anything now (even most 1-drops that get played have 3 health). 

It does have synergy with Xyrella, the Devout and Amulet of Undying which might be quite nice (if not extremely frustrating for the opponent!). 

"Nobody expects the fourth Sire Denathrius!"

Taunt makes this card solid. Not great. But decent.