Honestly having some Mighty spells be 3 [i]or[/i] 4 points (depending on potency) would be a saving grace for my planning abilities right now. That Grisly Trophy is a real resource hog, and I dunno that my idea is all too powerful compared to your example.

I asked this in our Discord chat but it may be worth repeating here, just in case it'll help someone else: "do I understand correctly that once we've selected a category of magic to 'belong' to, any spells which we know outside of this category cost one point extra to know?"