They could make it so its point cards, and the prizes based on how many overall games played? To encourage more gameplay and help people get more cards.
like say... 10 games = 1 star, 20 games = 2 star, 50 games = 3 star.
Can't go higher than 3 star though. Not sure if it should be random non-triple-copy cards given or ones you can pick though.
More cards is only a good thing at this point, especially 3 stars. After all, the real money-makers are the 4-5 star cards anyway. At least in my experience, 3 stars are actually more of a deterrant, as they are too hard to get and too numerous. It comes down to "who cares, I know I can't get them nearly easily enough for their rarities, so i won't bother even hoping", where as if i wanted 4-5 stars, I could buy a box and have a decent chance, especially with 4 stars.. so I can hope.