Kazakus should learn to behave like one other dragon. You may have heard about Galakrond.
Blizzard should assign rarities to his treasures and you get to pick better rarity ones as you play more dragons. We do have treasures that do not win game on their own. And than you have rager, wand, queldallar and book. Give him more depth.
And miracle growth is overpriced. It should be 5 mana draw 1 summon elemental with taunt and stats equal to your hand size. (Dark alley pact from Stormwind)
And maybe replace mana Crystals for empty ones on Guff Hero card.
Kaelthas was also hit too hard. They could change him to 7 and 1 cost but let him have old effect via corruption
switcheroo cannot be abused hard if you swap stats between your and your opponent's minions. But 2 mana. But I do agree there is a card that does deserve a ban from priest. It a boar. Elwyn one at that.
Control doesn't have tools to beat this deck with how much removal priest has access to.
Control has some chance against quest rogue (caverns) although nerfs to sap,vanish and Scabbs would be handy.
With the amount of support pirates have gotten they should lose their southsea captain.
make Mr. Smite battlecry ALL minions have rush. And to be honest we need effect like this in the game to make the game feel better.
I would also like to propose 2 nerfs to mechs click cloker 2 health but no divine shield and security automaton 4 health but only gains attack.
And possibly nerf sweeper to deathrattles instead of battlecries