Honestly can choose between 2 things.

1: PRIESTS. I find it highly disrespectful that i have to keep playing the game while removing... one... certain... card.. every... turn.. "GREETINGS fellow Humans huehue" (or Khartut Defender) I'm happy they are making priests more board centric in stead of infinite resses/necromancer, but most of the time i just concede the second i find a priest. Why play 1 game against a priest, while you can play like 4 games against other classes in the same. (Btw. this comes from someone that likes playing control decks.)

2: The Paladin Treatment: I HATE how paladin only gets new gimmicks every expansion. This expansions Librams are fun, and synergies a bit in wild, but in standard, paladin gets close to 0 support for existing archetypes, EXCEPT MURLOC PALADIN. Paladin used to be this fun class that's good at most things, just like shaman. But now paladin is just a shell of it's former glory. (Except in wild, there paladin is pretty good because of Baku the Mooneater) If only they had you know, given paladin better control tools at least. Paladin lacks GOOD board clears. Paladin lacks BIG late game clears, and small clears/bursts before turn 4. Also the new Libram is a arguably weaker version of Shrink Ray. It now doesn't hit your own minions, but that comes at the price of your opponents minions keeping their attack stat, making it so you take a bunch more face dmg while removing them.

Basic: Polymorph: Nice removal, reliable and helpfull against a number of decks. (Mainly Ress priest). 

Common: Hallucination: Oh i miss this card in standard... We kinda got [Hearthstone Card (Pilver) Not Found] and Dragon's Hoard to replace it, but i still miss it in stanard. At least it's still good in wild thief rogue.

Rare: Spirit of the Shark: Was only played a bit in ROS battlecry Lacky Rogue, but it's still my favorite card from RA. Also in wild it's rogues "Budget" version of Brann Bronzebeard.

Epic!: Puzzle Box of Yogg-Saron: Powerfull card, worth the 10 mana, and ALWAYS Lethal. (You never know for who it's going to be lethal). Also i find it funny how this was an UPGRADE to Yogg-Saron, Hope's End for quite a bit. Thank goodness they unnerfed yogg. (Gnomeferatu get's close second tho)

WOAH! LEGENDARY: The Amazing Reno, Zephrys the Great, Face Collector, Bazaar Burglary AND EVEN Yogg-Saron, Hope's End... i'm sorry. But i gotta stick to the one... The one... THE ONLY... Tess Greymane! Tess was the card that managed to hook me onto the thief/burgle rogue archetype and everything you do in that deck is just prepping for this one card. And when you unleash her (And put like 10 copies in your deck with Togwaggle's Scheme) It just gives such an.. indiscribable feeling. It just feels sooo good. Even better than yogg! (Mainly because you have a lot more control over what get's played)

Not sure about how powerful it is, but in the right deck it might be decent?

Really good with Warglaives of Azzinoth. Allows you to trade into a few minions without taking damage to FACE, and maybe even attack the opponents FACE. 

Combo disabler.. Pretty nice to have if there are a couple of combo/OTK decks in the meta.

Great card. Gives Demon hunter some board presence and boosts their attacks by 1. (As long as you don't equip another weapon, unless said weapon has more attack). 

The set looks a lot more control-oriented, which i really like! I hope this will mean we won't get another super aggro SMOrc year of hearthstone. I'm really hyped for a few things. The first being the mage prime. It seems like a fun, and powerful card. The second thing are Librams. Librams seem pretty good. Yeah it's ANOTHER new archetype for paladin, but it seems pretty good. Maybe the The Last Kaleidosaur will finally be 'decent' enough to see play in wild because of the librams! (But really, why is murloc paladin pretty much the only archetype in standard that gets some support?)

The last thing i'm hyped for is SECRET ROGUE. Secret rogue has always been... too bad to even consider a meme deck. But now it looks really strong. I'm definitely going to try some kind of Bazaar Burglary Secret Rogue. (It's unfortunate that Tess Greymane rotates...) Also on a side-note, i'm glad they finally gave rogue some stealth synergy. This expansion is going to be really interesting and fun! 

Oh! thank you for featuring the deck! Hope people will have fun with it! 

Nice! Zephrys kept missing lethal for quite some time (in my experience) glad to see that's fixed. Also love that the secret interaction is fixed. That was REALLY annoying.

So many good Jokes. The Hunter ones are awesome. Also mage has a (comic) sans Joke. That's Nice.

Also libram of hope, blackjack stunner, maiev & bonechewer are really good as well.

True, but still it's hard to remove if the opponent has not drawn it, or has already used them up.

Woah, neutral Soul of the Murloc. looks good.

Feels a bit too slow for murloc decks, but it can come out the turn after the imprisoned murloc comes out. i'm torn on this one.

Scary in arena, bad in constructed.

more anti ress priest. i like it. the more anti ress priest stuff we get, the better :)

Nice packfiller, but thats mainly it. Oh and decent in arena.

Oh. My..... This will be played a lot in handbuff decks. This is a scary card.

not good. If you want spell damage their are better alternatives and it's delayed, while you want it activated immediatly.

This will replace Goblin lacky in a year. Just gotta wait for it.

Kinda a meme, but i wrecks control decks. Image this against a ress priest that for some reason has no way to counter it. I like it.