>>96367415
I had another idea
instead of limiting the copies of a card to an arbitrary number (either 2 or 3) I'd use a point system by which each card could "cost" a number of points to include to the deck depending on how powerful or overall useful is considered to be
a player has to have exactly 30 cards and 100 points worth of cards in their deck

this way, a player could choose to have many copies of expendable low-level cards, several more expensive cards, or a combination of both in any measure they want
this point allocation system doesn't solve anything by itself, but it makes the game more similar to other miniature games

not only that, but I could give cards a base point cost and add multipliers based on their stats, rank, and abilities, so the player would have to calculate each instance
this way, I could easily change and adapt the cost of specific values and multipliers in case the cards are deemed too broken, making them more expensive to add rather than banning them outright (only if sanctioned play ever becomes a thing)