I guess if banning the cards from the draft is too hard, then I can understand.
Although restricting Gensokyo Chronicle to 7 seems very harsh, even more so when mummy hand is unlimited in StS. I've legit had decks with more then 7 abilities in both games. You should, at the minimum, considering increasing the number to 10 or more.

Although the ban the cards from the draft solution would be better then nerfing the cards from the draft. So the player doesn't have to get drafted from cards that have half their effects no longer working. As regardless you are effecting the same quantity of cards.

I would be interested in a mod that does that alone.

Despite the multi-tier ruleset this mod doesn't seem to do much and it's kinda the point. 95% of the time you'd be playing the run normally but random Breaking Boundaries draft won't turn the optimal gameplay into stalling for 9999 gold.

Sts approach would be even more restrictive, imo. Plenty of cards or their upgraded variants give just a little bit of persistent resources so they'd have to go on a ban list. Also when it comes to generating cards choice of "Do I take a better card for current combat or greed for resources" would be removed.
(Also ban approach is so different from code perspective that it might as well be another mod)

Blossoming Seal works normally, I forgor to update the description, thanks.

If you care at all about my opinion, I'd

- Make cards that generate other cards not make HP/Gold/Max HP generating cards at all

- Above suggestion includes Call On Friends (added this as another suggestion since you included it seperately)

- Uncap gensokyo chronicle healing

- Remove the restriction on Blossoming Fantasy Seal

But until then, I probably won't be using this mod.

I like the idea of this mod, but I feel like it's a bit strict. I liked how slay the spire handled everything.

Things like trace on and BB shouldn't, in any case, give you something that gives you gold, healing or max HP. This is similar to how StS does it.

Something like gensokyo chronicle giving you 2 hp after every ability should be allowed. As it requires you to have a deck that can play a bunch of powers, which effectively requires you to have a deck that fits the exhibit. This is also similar to how StS does it.

It also seems really bias that you chose to allow the bites to heal infinitely but not Blossoming Seal. I think both healing should be allowed, as it's typically hard to pull off and not so often you're allowed to pull off, and healing to max HP isn't exactly game breaking. StS doesn't have a non-exile non-bite source of healing, but it does have strength + reaper, which can heal you to full much more consistently.