Dr Boom and Sneed's, amongst others...
There's no power creep in HS, honest.
Before GvG, one could at least hope that getting Alexstrasza, Cairne and Sylvanas, along with a couple of Brawls and another Shield Slam could actually happen in less than a thousand years. After GvG and the pack separation, I don't even want to spend gold on vanilla packs anymore. Grinding Arena? Great, but it leaves a bitter taste after you get trounced over and over and over again against people with legendaries or five Frostbolts and Flamecannons, whilst your only epic is a Doomsayer taken out of necessity. Let's do some ladder then, right? Sure, I had an awesome time climbing from rank 22 to rank 18 with my silence-priest "anti-meta" deck last month, and it worked like a charm, until I got to rank 17 and people started playing good decks. When I see control warrior, my head legitimately starts hurting. I mean, c'mon, how can a guy use an Execute on a ****ing Ancient Watcher that's just sitting there on turn 2 (and I don't even have activators in my hand) and still win in the end?! Well, I want to try that out too and see if it is as good as it seems... oh, wait, I've not got the vanilla legendaries I need for it to work.
Getting any reasonable progression starts to feel more like a chore than anything else. Also, my GvG epics are a Dark Wispers, a Shadowbomber, and a Hobgoblin... when all the fun-looking Priest decks use stuff like the recombobulators and shadowboxers, both of which I do not possess. Damn it, game, I was playing Priest before it was cool, and now you gate me?!...
At this point, I'd rather play a match of Battlefield 4 if I've got 15 minutes to spare, or some Divinity if I've got more time. But that isn't a thing all too often anyways...