Hearthpwn

Prepare to meet some quest mages, pw, odd dh, secret mages and mech paladins. :D

enoX_36 - yeah greater healing potion is a good heal. But like other guys said - you can put basically whatever you want and then optimize. Core cards will always be the same (like 20 cards) and the rest can be changed depending on matchups or personal preference.

I mean for me it is fun and I reached top1000 legend on EU last season with it and this season I'm currently at D2 (I only played this deck).

About that legendaries - emperor and loatheb are not necessary imho and I dont run them in my list.

Kazakus is nice to have, you can get some polymorf effect, clears and draw from him. Instead you can run like kabal courier, zola, some other value card.

Thalnos is great. Against aggro he is amazing with spirit lash, can pump breath of infinite to 3 damage and he is a draw as well.
I also run Azure drake, which is kinda like thalnos, but for later (and helps in dragon package). I think if you dont run thalnos you need additional healing, because he is amazing against PW and DH.

In current meta you need to accept you'll never beat quest mage, you'll loose a lot against secret mage and mecha cthun will also destroy you, unless you pull combo piece with rat. Gluttonous ooze is a must have. Psychic scream as well. 

I don't believe this deck is that easy to pivot and I've played it a lot in the past and now after unnerf.