Zul'jin is a pretty interesting hero card. My first reaction was negative - Zul'jin comes down after Deathstalker Rexxar, but his hero power is a massive downgrade once you've cast the death knight hero. But later I thought better of that - Blizzard was never going to print a Hunter hero card with a hero power as broken as Build-A-Beast, the Zul'jin hero power is still an upgrade on the base Hunter hero power, and the effect is powerful enough to make you reconsider spells you might never have played before. (For example, Crushing Walls is kind of weak, but might be great cast alongside a Greater Emerald Spellstone and a full set of secrets in the late game.)
While Zul'jin seems to fit easily into Spell Hunter, I think that deck has too many poorly interacting spells today - your Unleash the Hounds can interfere with your spellstones and To My Side!, Kill Command and Hunter's Mark can backfire in a big way, Tracking can drive you into fatigue super fast, etc. Rather, I think that Zul'jin wants to be played in a deck with a focused set of spells that turn his effect into a kind of "late game refresh everything." If you run just secrets, the spellstones, and safe hard removal like Deadly Shot and Crushing Walls, Zul'jin will retake tempo on the board in a big way. Throw in a couple of Secret Plan's to generate more resources, and if you're playing a beast package, you can throw in Dire Frenzy, Master's Call, and even Flare to try and turn Zul'jin into a way to gain card advantage without digging yourself too deep into fatigue. Now you've got a card that clears the enemy board, fills your board, draws cards, generates cards for your hand, and shuffles cards into your deck - literally everything you could possibly want in a late game bomb. That's definitely a deck I'll want to experiment with.
3
Thas card could fit in an even Shamen.
1. You have a lot of top tier 2 drops in your deck.
2. Upgradeable Framebot is good with Flametongue Totem and Dire Wolf Alpha, and maybe this opens up a little mech package you could fit into your deck.
3
Does this card triggers Gadgetzan Auctioneer multiple times, bc it gets "cast" again?
14
Upside: Hunter has definetly space in the 5 Mana slot
5
Priests Death Knight: Cards from your oponents deck costs 2 less mana
6
What about Frost Lich Jaina + Pyros + N'Zoth, the Corruptor for high endgame value with just 3 cards?
-3
What about Sindragosa and Ghastly Conjurer combined with Bonemare so you can use those low cost monions?