Hearthpwn

I think the main thing it needs is a big AoE that isn't Psychic Scream, since our minions are very sticky and we'll end up being forced to shuffle them before we can get value. We'd rather something that hits both sides with damage, because then it's more mana efficient and pops the eggs, so something like Dragonfire Potion would be perfect! However I have a feeling such a card won't be printed until that and Duskbreaker rotates out, since then priest would have too many board clears in standard.

Probably not good enough in constructed, it fits in a slower druid but it has negative synergy with both Oaken Summons and Witching Hour. Good arena card though!

This seems strong in Druid, as this is a very good thing to play early (due to mana ramping) against aggro/flood decks. Not sure if it's better than Spreading Plague, but it might be depending on what kind of aggressive decks are good!

Tempo warrior already has muck hunter and darius as 5-drops, so I don't see this getting much play.

Seems good for quest priest, since this is 3 deathrattles on one card!

Hunter seems to be consistently one of the best classes to ladder with on a budget, with lots of good low rarity cards from classic/basic and generally getting several good new commons each rotation.  I feel this deck can struggle on turn 2, though, since 2 out of 3 of your 2-drops are basically Frostwolf Grunt if you happened to miss your 1-drop. What do you think of dropping the trackings for a pair of Jeweled Macaws or Fiery Bats?

This is very similar to the list I've been running, it's probably the strongest choice overall. Some other cards to consider:

Violet Wurm because it's good to have a beast to help thin the deck with Curator, and this is a very efficient proactive minion under the ruleset. Vilespine Slayer or Ironbeak Owl (curator synergy again) to deal with buffed minions. Shiv because it cycles and can be used to hit face with Malygos up. Evasion basically works as an ice block if you need to buy some time as you cycle through the deck. Spectral Pillager can be pretty powerful at the end of a big auctioneer turn.

Naturalise on your own minion is much worse than Dark Pact, though, unless you're actually trying to fatigue them. But maybe it's worth it since it is *very* powerful to instantly kill Hadronox, and killing a devilsaur cube is lethal a lot of the time.

Grizzly is basically our Voidlord; the powerful taunt we cheat out to stay alive. I think it might be too greedy to cut it, once people start playing aggressive decks again (usually a few days into the expansion).

Edit: While you can't Oaken it out, you do only need to pay 5 mana for it, then it's in the beast resurrect pool. Don't forgot that it's also at the full size if it comes out of a cube.

Rarity isn't solely based on how good the card is, but also on how unique the effect is. This is certainly a very unique effect.

It is a relatively bad deck compared to the meta picks, but you can definitely win games. My record isn't that bad with it, admittedly at low ranks. You just need to identify how you're going to win in each matchup and play accordingly. I might give some more details in the main page soon if people still care about this deck.

There are quite a few aggro or midrange decks where this downside isn't relevant, however a vanilla "4 mana: 5/5" is just not good enough for constructed. The only deck this would have real synergy in is a Jungle Giants druid, and that deck actually wants its deck so you don't fatigue instantly from the heavy card draw after playing Barnabus the Stomper.

Hobgoblin Token druid looking pretty good with this thing and Crypt Lord!

Well, sometimes people play around Mirror Entity by playing Battlecry minions, so this at least allows you to use those battlecries. It also provides some added value for Secret mages, which they definitely wanted with Duplicate gone. That said, this card is certainly worse than Duplicate because it's far less controllable.

A problem with using this in Lakkari Sacrifice is your opponent can actually discard your Nether Portal if they hit it again after you complete it. So, yeah, seems like Treachery shenanigans is the most consistent way to use this thing, but that seems weak too.

Battlecry is very powerful vs Jade decks or giants, similar to Lightbomb. The Hero power seems relatively weak for an upgraded hero power, unless you played Raza the Chained, in which case it can be pretty crazy!