Thank you for your feedback!
I think most (older) players would agree with you on the Beta cards, so maybe they shouldn't be mintable after all, instead only giving them out as ghost-cards. Don't think that would hurt too much, as you'd still have to buy from the limited supply if you ever wanted to get past level 1 for any of the cards.
I'm quite sure a lot of players would aim to mint the most valuable one and flip it for some other cards. I don't think that's an issue, though, as that would just help to increase the value of other cards and slightly reduce the value of that card. If it becomes an issue the amount of needed potions could be linked to the current market value of any given card, like make the cost 1 potion + 1 potion for each 0.1$ the card is currently traded for.
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