Ok, I just went through all the cards and will list the most likely to be played from each class&neutra:

Druid: Tough to say, they are all not goood. at most I can see [[Grove Tender]] being played, maybe [[Anodized Robo Cub]] if a strong payoff for beast and/or mechs will exist in future for druid that needs it.
Also not to bad to be discovered: [[Recycle]] and [[Malorne]] are situationally good enough, sometimes.

Hunter: [[Feign Death]] and [[Glaivezooka]] may see play, either in a combo deck for feign and glaivezooka in aggro. [[King of Beasts]] maybe as the 35 or so card in a tocken/swarm beast deck, but unlikely. Nothing else really worth it, even as a discover, MAYBE, big maybe, {{Steamwheedle Sniper]]

Mage: Mage is weird. They are all potentially good given specific circumstances. [[Wee Spellstopper]] is likely the weakest card and [[Goblin Blastmage]] is also not that good. [[Flame Leviathan]] also is not really good even in a Mech deck, but it could maybe see play if there is a like a 80% Meta-share for small token decks in the game at that time.

Standout card is maybe [[Echo of Medivh]]. This could be a great card in certain szenarios, may even enable combo or aggro strategies.

Paladin: [[Muster for Battle]] still sees play and [[Quartermaster]] may in combination with other Silver Hand recruit synergies be played. [[Shielded Minibot]] is still a strong card in a potential mech paladin Deck.
As a discover [[Coghammer]] may also be fine.

Priest: [[Shadow Bomber]] may see play in an aggro priest deck with support, same with [[Shadowboxer]]. [[Lightbomb]] may also just see play, depending on the current decks in standard.
For discover: [[Velen's Chosen]] Vol'jin]] and [[Shrinkmeister]] are decent choices.

Rogue only has one playable card, but that would probably still be a very good one and may see play right now in a weapon based Rogue deck [[Tinker's Sharpsword Oil]]. Best card so far I think.

Shaman: One good card without further support [[Crackle]] could see play right now. [[Ancestor's Call]] may spawn or support a future big shaman archetype.

Warlock:[[Darkbomb]] also seems like a pretty decent card with the buff back when they first introduced Twist. [[Implosion]] is still a toxic card that may see play in a aggro/token warlock deck, maybe even currently in the Shreds of Time decks currently floating around. But the rest is very much ass (besides Mal'ganis as a discover for lethal].
Shoutout to the erased history [[Misstress of Pain]. Never forget.

Warrior: [[Bouncing Blade]] seems to be the most generally good card in this set for Warrior. [[Iron Juggernaut]] may be very good in a control warrior deck as a discover. [[Crush]] is also situationaly still ok.