I might have the shittiest luck when it comes to fighting priests but it seems that more often than not they steal my Hex/Fire Ele/Lightning Storm. Rather frustrating to play against especially since cards like those where meant to be balanced for the class that has them. Mindvision and Thoughtsteal are just a crappy concept in my opinion. Either the priest gets hosed with some trash cards he can't use because they work best with a class combo they don't have access to or they get even more removal/boardclears than they should have. And everything in between of course.
Now at the moment of writing I might be more than a little bit biased since a priest just coined thoughtsteal on turn 2 and wrecked my Totem + Feral Spirits the turn after with the luckiest rng.