Hmm did it change to "this turn" while i was replying or did i misread it?
I like the concept, since it doesn't work on itself i assume. However there is currently no way to increase the amount of spell cards of one type you have yourself, unlike creatures (fractal/mitosis. Mindgate working only on the enemy), and that is very likely for a good balance reason. You would have to investigate this issue in-depth. Think of SoD.
Its always had "this turn" in there. This is a spell card not a permanent, so its a 1 turn deal.
I was thinking of making it a permanent, but that just seemed like it could get out of control too fast.
Since this is not a damage or healing spell, it wouldn't fall under the influence of its own effect.
I'll see what people in design theory thread think about balance issues. Feedback seems a little sparse here.
Essentially its an attempt to help spell / creature-less decks have a shot at being successful without needing OTK bolt or gas tactics.