Hearthpwn

Thx for the feedback (I didn't got a notification, so I saw your post right now).

But tbh I want to disagree on that point: Yes, Shadow Bolt can reasonably be considered a weak card, because it has a narrowed effect - dealing 4 damage just to minions costing only one mana less than the effect (i.e. 3). Nothing else as a bonus, just this plain effect.
Yes, but for me this is was more than enough to justify the inclusion in my decks. If we had Darkbomb, I would gladly use that card instead, but regardless its effect was still far useful than Drain Soul's. The small heal is super irrelevant to me, when the damage to the enemy's minion is being softened. Those 2 points of damage can kill most of the 1-drops, but if I want to clear something slightly more durable, if I want to have an effect similar to the Darkbomb's one, I have to spend 2 resources just to clear a 3 health minion... 2 cards for killing an early drop. And I can't understand how the "sustain" can compensate for that. There is nothing powerful in a turn like that; I'm wasting my spell damage minion on this play rather on an AoE (Defile, Hellfire), where I can kill more threats. Not to mention, that the utility of this card in the late game gets even lower.

About Lesser Amethyst Spellstone and the package from Toast's clip - Look, I don't disregard those cards and their usefulness in general. Health is a resource, and for their effects (1 mana combination of Loot Hoarder and Novice Engineer, 2 mana Wyrmrest Agent with no dragon condition) the 2 health price is like a no price at all. I don't overlook at this benefit. The problem is - I don't feel like the (full) package is that necessary. I'm personally more of an AoE and a minion-centered-deck person than a one of single target-removals. Yesterday in many games I top-decked the vanilla version of this spell. While, yes, the aforementioned cards are extremely cheap activators (they are in fact more than plain activators), I felt like I diluted my deck with unnecessary inclusions - I had the feeling, that I don't need that many taunts or single-target removals. And I don't care if I'm going to sound lame, but the 2 damage might be reconsidered in some situations, especially against burn decks or aggro ones with reach and silence effects. And I'm not talking about the first few turns, but more about the late game, when you took some damage from the board or from spells and play this having less than 1/2 of your health. That's why I decided to go with a more "safe" approaches, but this is after all an experimental deck and we play in experimental times, so everything can change.

Anyway I've decided to keep only 1 Lesser Amethyst Spellstone in the deck, because I like how I can upgrade it (unlike Shadow Bolt), but even top-decking one 4 mana spell deal 3 damage isn't the end of the world. Having 2 of those, when you are yet to activate them, is kinda punishing imho.

I think I will give tomorrow the big-boned demons another try. I will replace the 1/3s with them, as I already have mistress in the deck.

:D It's funny, because for me the beetle is the weird inclusion.

Maybe the Shroom Brewer doesn't suit you, but can you consider using Mistress of Mixtures? She does a far better job than the beetle - 1 mana cheaper (she curves better) + 1 more point of heal. The heal to the opponent is not so relevant, because I don't have almost any burst in my deck, I win by exhausting them down or stabilizing.