All data cards including probability for rewards should be removed from the game. RNG style rewards for real money are nothing less than hazard and hazard in many countries has very tough rules - first of all hazard game should have only 18+ rating.
CG and EA would do everyone a big favor if they replaced all probability based cards with fixed price / fixed reward cards - aka know what you are buying before you buy.
There are already talks about changing legislation and I hope it will happen very soon and ban this illicit practice. Showing probabilities for current cards most probably didn't happen as openness to gamers but as the first step to avoid legislation issues.