Hearthpwn

Extremely good in arena. Not only heals your minions, but also gives them a stat buff, and every time you get a charge or rush minion you can use that to attack and then evolve again. Acts as a pseudo board clear while also healing your board and making it more dangerous. Has won me countless games. and don't forget the chance to run into a card like Lyra the Sunshard, Radiant Elemental, Sorcerer's Apprentice or even Archmage Antonidas!

Wait why didn't they change it to Echo? It's the exact same mechanic, how bizarre.

Nope, I wish though, the Hearthpwn post on the new set has a link to where they said on Reddit they aren't, but maybe if we complain enough we can get it to happen lol

Opponent using Shaman
In Turn 8

Before: The Beast 3/3 (Inner Fired) + Corrupted Healbot + Injured Blademaster

After 8-mana 'unstable' evolution: Ragnaros, Lightlord + War Golem + Core Hound

I conceded.

I just stole this in my Razakus deck and now we have Exodia Priest. I just had to play Radiant Elemental and a Novice Engineer to kill everything!

I think this card is really good because it sort of reduces the RNG unstability of Evolve. It allows you to evolve multiple times reducing the odds of getting a poorly-statted minion because you can stop at any time.

Thoughts teal Intensifies

Grand Archivist pulling Unstable Evolution is not that bad. Maybe it's a glitch but the copy stays in your hand because when Archivist activates, your last turn is already over.

Lol I know i'm late, but couldn't let this nonsense uncorrected. You don't get to keep Unstable Evolution if it gets Archivist pulled. The card clerarly states "repeatable this turn". Thus, since it gets cast on the end of your turn, so your opponent's turn according to the game mechanics. You keep it in hand during your opponent's turn and then it disappears on your turn. I even got this situation exactly once. And the behavior was this one. (Also have the footage if you want)

That's odd, because what I said happened to me exactly as I described. I'm certainly interested in that footage.

Can't wait for the youtube highlights of drawing this from Tolin's Goblet!!

one of the best cards so far

Why, this is Stable Evolution, you get two shots and it's much less randomized.

This card is amazing. I love all the synergies it has. For example, Grumble, Worldshaker. You can put a few totems and weakened minions in your hand, then play them on the next turn and upgrade each of them until you get better ones. It should guarantee that you'll have enough targets to play this effectively. Also works great in a jade deck since the golems always have low stats for their cost. Or you can save it for an Evolve turn, and use it on all the minions that rolled unfavorably. 

Also I can't wait for this combo in arena: Wild Pyromancer + Deathspeaker + Unstable Evolution. You could basically do up to 5 damage to your opponent's whole board and only do 1 damage to the evolved Deathspeaker (unless you were unlucky and rolled a 1 health minion somewhere).

How does this card interact with Far Sight or Emperor Thaurissan ? Does it keep the reduced cost on the second cast?

Any way of getting Sorcerer's Apprentice or Radiant Elemental as a chamman? =p

i dont think it would, its more like add this card to your hand in the last part so you get a fresh one

Also you can cast this on your totems first to evolve into 2 drops

Apparently, some people still think this card is bad.
Amazing !