Hearthpwn

 My wish since day 1 is an in-depth Achievement system. Preferably with a combination of easy and insane tasks that can grant rewards in dust or cosmetics.

I just nailed it with my last class (Hunter). Finding Hunter and Warrior to be the toughest one to complete, took me about 6-7 runs each!

My brief conclusions:
Jade synergy seems to be the easiest way to win. Stealth is also insane. The Primordial Wand won me a lot of the final battles, especially with the Stealth synergy. 
Regarding endbosses, I got a 100% success rate against the Dragon boss, so easy! Azari also seems like a breeze. Darkness is pretty tough, but I think that the Eye-monster and Kobold King were the toughest, their value is as insane as their RNG with those generated spells!

In all, I'm super happy with the game mode but I hope to see more support for it in the future. Keep adding new bosses and items. Perhaps some more rare encounters. How about a super-rare chance to encounter another player at the same level as you? That would be the nuts! Some minor rewards or perhaps an "arena ticket" special purchase that grants better rewards would be welcome as well. It'll be interesting to see where Blizzard goes with this, and what the stats will show (when they eventually release official statistics).

I would like to see them keep it as a new mode. They could gradually add content with new bosses, treasures and cards. Would also love to see more rewards to keep me coming back.

Actually true. Whoa!

Quote from MTuser024 >>

I could have sworn i saw a kobold pirate art somewhere. 

Adapt to give this immunity to targeting could be sick. May put this into paladin if buffadin becomes a thing!

I think the effect can actually be very strong, if you build your deck around it. Big warrior with lots of weapons may force out their removal with Gorehowl, while this gets extreme value. If you get 1 swing in, it may be worth it depending on the result. With 2 or 3 swings I'd say it's definitely a good weapon. Requires a very specific deck though I think and I'm not sure it can be utilized.

So Dragon Priest can run two copies of a miniature Vol'jin, but swapping attack instead of Health. Not only does this become a 8/4 if you target The Lich King, but there's tons of combos you can follow it up with. Or even just allowing you to trade beneficially.

Super strong vs control or midrange. Pretty weak vs aggro though, but a 2/4 body is still fine.

I would be baffled if there's not some kind of support card for this. On its own, it should havr been 4 mana. At most 5.

Quote from TaoofWar >>

Lorewalker Cho meta confirmed. Cho mill with all the weapon buffs to choke your opponent's hand with spells they can't use unless they draw their legendary before you mill it. Bwahahaha!

If you manage to put Deadly Poison and Leeching poison this will be a tool that helps a control Rogue, which I would love to see one day.

Also, this is NUTS with DK Valeera, you can multiply your buffs and put a lot of copies of the weapon in the deck!

Quote from xFire >>

People keep forgetting that Y'sharj is rotating out...

Djinni of Zephyrs have synergy with this, actually. If you like some Wild shenanigans that is.

That's a pretty sick predition, nicely done!

Noooo, my Yogg-Saron, Hope's End! :( Definitely the worst random spell to be cast, unless you are desperate for a board clear.

I feel like this card should've been in the Un'goro set, it's a really strong support card for quest Warlock. You really only need this card. It's weird in Zoo because you do not want to clear your board unless you're deathrattle heavy. Weird in control too because you discard the hand. Requires an extremely specific archetype to make this valid, which as far as I know only can be the Warlock quest.