Is it me, or do problems tend to pop up every time it’s a neutral card that’s all the rage. Kron was hated as a 4/6. Blistering Skorn got hate as a 3-drop. Blue Conjurer, and for me personally, Owlbeast Sage still leave a bitter taste in people’s mouths to this day. Saberspine Tiger has also been a topic of discussion on more than one occasion.
Now we have the next neutral minion of the hour. Because it’s neutral, there’s a lot more room for abuse since you can use any faction’s card pool. We can talk all day about how Magmar has no position altering cards to abuse it (save Repulsor Beast, another neutral option), but when looking at a card, we have to acknowledge the most abusive aspects of that card, in this case, Aspect of Shim’Zar. It limits anyone playing against Vanar once the 6-mana turn comes (which can be ramped btw).
There are many cards that seemed balanced in most scenarios. Take Saberspine Seal for example. It was a 1 mana spell at one point, and was changed only because of the Baconator combo. That’s it, one combo. But because the potential was there, it had to be nerfed. Same with Thunderhorn imo, This + Aspect of Shim’Zar is too abusive. You can’t play around it because you’re at the mercy of the Battle Pet mechanic, which your opponent manipulates on their turn. Even if there is no other way to abuse this minion (there are actually plenty), the abusive combos would be enough to warrant a rework.
And of course there’s the problem with design space. Trying to introduce new Swarm styles and Battle Pets with this thing running around would be a challenge.