Sansen

Looking at carts in opponent's deck/hand was always a priest feature, starting with [card]Drakonid Operative[/card], following with [card]Chameleos[/card] and [card]Madame Lazul[/card]. Also it is possible to find out which cards are in opponent's deck through [card]Thoughtsteal[/card] and similar cards.
It …

For me as a priest player this card is just a spit in the face.
One more unique priest identity feature is stolen (after silence) and also it badly damages classes with no draw.

Great for warlock but almost useless for priest. So weird idea of small minions synergy without any draw. Don't forget that he also blocks big minions from being played when he is on the board.