Hearthpwn

I don't think that this is the worst card until now. This is trully bad, but with some buffs like making it 3/3 or 4/2 it can be pretty powerfull on a control paladin.
And every class receive unplayable cards. I guess that paladin received good stuff in the pasts expansions, like all the support to libram and secret paladin. I can tell uncontable unplayable cards in other classes, like the cost 5 3/5 that reduces the cost of every corrupt card in priest.

Brann Bronzebeard + Cap'n Rokara new cancer meta incoming! A permanent board Arghhh-worth having that shoots black peas all over the opponent board and summons strange pirates as meat shields

For me  Tess Greymane comeback is the biggest :S

Awesome potential!

I might consider coming back to HS this time---

No. Stealer of Souls required "do damage". In an entire deck made for self-damage which required not much deck restrictions.

Kael'thas required cheap spells for handling boards and big spells for huge rewards. That was no restriction for Guardian Animals Druid, it was how the whole deck worked by default.

Here, you need to make your deck in a way that you will ALWAYS have one naga and one spell in hand. That seems very difficult to achieve and RNG dependent. The other 2 weren't RNG dependent. As I said, we need to see what kind of support they give to this. Right now it doesn't seems broken. Also, refresh mana is not as strong as free stuff, as the other cards worked.

I don't think it's about a lesson. The whole Hearthstone design since ages is around mana cheat. It's not that they didn't learn, is that it's how the game works and will always work. And I think it's ok. Mana cheat is cool when handled properly.

The thing is when they don't test it and release something broken, like Stealer of Souls or Kael'thas Sunstrider. This card doesn't seems broken. Requires a whole deck around it, and it'll have a big RNG factor. You won't always have specifically one spell - one Naga combination and maybe at most will be able to trigger this one or two times.

Anyways, we have to wait and see, because maybe the start showing up more nagas and mana cheating spells that synergize and in that scenario it'd broken af lol.

Seems fair honestly. 4 mana is a lot for this sort of effect.

I doubt there's going to be very many 1 cost Naga.

I dont think you will be able to do insane turns where you keep alternating between a naga and a spell but just being able to play a naga, get 2 mana back and then play a card like first flame and then refresh two mana and effectively  be gaining mana and being able to play more spells might be strong.