So after my last hot takes i present an idea i am really convinced of. Potion should have been in the main set and always out, like curse. Like curse you wouldnt buy it if there were no interactions, but if there are why not. BUT it should not give potion to spend like now, but instead a potion token. You could use that to buy potion cards (which would make cards that cost multiple potions possible). Also with that you could make cards like "spend a potion token for +3 cards +1 action" or so that dont cost potion. The design space would be unlimited. It would make potion way less swingy and every expansion could have a bit of potion in it.