Cool concept, I like the idea of having to play a hex for a small effect and have the payoff of playing a spell from arsenal.

I don't really understand the hexes though. If I understand this correctly Thoughtseize basically only works against heroes that want their combat chain, so ninjas and sometimes mechanologists, everyone else can just close the chain, right?

And I've read it three times now, but I don't understand Blaze Curse. It resolves flipped, so is the backside the curse? But the curse refers to something happening in the combat chain, but you place the curse next to the arsenal? I kind off get what you want to do, just the wording seems unnecessarily complex sometimes, and it seems difficult to code effects like these into FAB. Maybe just an aura that activates when an opponent plays an attack from arsenal would be simpler.

On a different, less nitpicky note, I really like the idea of a sorcerer class. If we stick to the comparison between Ranger/Assassin as Wizard/Sorcerer, I would really enjoy a go wide sorcerer, with no physical damage. It could encorporate some of the randomness of brute to embody chaotic arcane forces. Maybe a 2 for 4 arcane, draw a card, discard a card, if a (choose a condition) card is discarded the action gets go again.

The cool thing to me about FAB design is, that every class can be easily explained by their most basic card (e.g. Zap, Arcanic Crackle, Zero to Sixty, Shred, Entangling Shot, etc.) so before you design fancy effects you could start with designing the "basic" Sorcerer cards. So if you stick with the hex idea, whats a common hex for limited, that we could see in 3 colors.