Stowaway (2) - 5 mana 4/4 with minimal upside. Generally bad.  

Frizz Kindleroost (4) - Standard 4 drop, with a relevant upside for this rotation. Should average minion most of the time though.  

Ancharrr (4) - Slightly worse then a 3/2 weapon, but drawing 1 card from this makes this excellent.  

Dread Raven (4) - Solid tribe and stats. Seldom seen upside.  

Kobold Stickyfinger (3) - Similar to Kezan Mystic, but …

Chenvaala (4) - 3 drop stats are fair, but the upside is a bit of a stretch to achieve. It's an Elemental which counts for something.   

Dragonqueen Alexstrasza (5) - The average deck likely will have at least 1 …

Sanctuary (4) - Insane card to open with. It either forces opponents into suboptimal face hits to prevent a 3/6 tempo swing or potentially forces 2 mana pings early. Coin this out early and you probably win on turn 2. …

Veranus (5) - Equality attached to a properly statted 6 drop. I mean, this set is getting ridiculous.  

Necrium Apothecary (4) - Similar to Elven Minstrel in terms of value. Very solid option.  

Crazed Netherwing (5) - A …

Dragonrider Talritha (4) - A playable 3 drop with a pretty powerful deathrattle. Judging by the initial reveals there seems to be ample opportunity for Dragon synergies, so this should be pretty consistent.  

Shu'ma (4) - It's not the …

There was a 3x class card offering adjustment that happened mid way through dual class event.  

Blizzard did not revert this adjustment when dual class ended.  

Blizzard has just reverted this adjustment as of the latest patch update.  

Fairly certain when you play Nozdomu you will gain empty crystals until both players reach 10. 

Your opponent will get to use the full 10 crystals FIRST.  

[spoiler text="Legendary"]

• Deathwing, Mad Aspect (5) - 8 mana 12/12 on empty board. Huge come back card, less good if ahead.  
• Dragonbane (5) - 6 mana, 7 face damage on empty board. Otherwise, better Auchenai Soulpriest …

Initial Impressions of dual Arenas after about 100 games.

My choices for 1st/2nd class. Anecdotal.

Paladin, Warlock, Shaman / Rogue, Warlock, Mage

• Establishing early board is extremely important. In general, there seems to a be …

Zephrys the Great (2): Similar to Kazakus in power level and digging ability. It might be even better in some classes that can pull off the highlander deck list.  

Octosari (2): It's fine - even if you don't full …

Colossus of the Moon (2): Big dumb minion that will be impossible to removal via minions. Lack of initiative and flexibility makes this card a high average card at best. 

Plague of Wrath (3): Seems fine, a weaker Sleep …

Diseased Vulture (1): Fair 4 drop stats with upside. Can snow ball out of control and generate quite a bit of value. As a 6 mana play, it should be better on average then Murloc Knight.  

Neferset Ritualist (1): …

Desert Obelisk (5): Pure garbage for Arena. 

Riftcleaver (1): Has some limitations since you're obligated to kill something when you play this. Otherwise it's insane. 

EVIL Recruiter (3): Without ROS lackey support, the new set needs to show …

[card]Bazaar Mugger[/card] (1): Feels like a premium card. It's going to often be a 2 for 1 card, maybe more. 5hp means it's likely to survive a small kill. The random class minion is likely better quality then random all …

Armagedillo (2): Decent stats for a 6 - although not premium. The effect is insane, and has game winning capabilities if it goes off more then once. Keep it mind it's an "all" effect, not just one, so it can …

Plague of Madness (1): Insane tempo swing on the turn you play this. It's a 1 mana Envenom weapon, or doubles as 1 mana 2 damage weapon. You will always have the initiative when you play this which should make …

Impbalming (1): Not much competition for Warlock hard removals, and if bucketed "low" it should be a snap pick. The prevalence of this card might depend on how Demonbolt is bucketed. The draw back is irrelevant if you never draw …

Quote From Demonxz95

I'm not a big Arena player, but if I may, it feels a bit strange for 1 to the highest rating, and 5 to be the lowest. In most cases, you expect the other way …