As mentioned, Blightcaster could be useful in this concept. I'd also take out Essence Extraction, I've found it's not that useful overall. You could replace it with Battle of the Bridge, if you got that recently as a reward, it's a cheaper and probably more powerful (with all those servos) version of the same effect.
Possibly Magnifying Glass, for a bit of extra mana and the occasional Investigate token, and you wouldn't have the risk of losing your servos from a gem conversion.
Hah! I didn't even look at the dates before I posted.
I was genuinely trying to be helpful on something I thought was a more timely situation, rather than just pontificating. Though I realize it might be hard to tell.