I think the deck that the Random rule gives us should be similar to the "Recommended" built deck. It would still be random, but at the very least be made up of the highest cards that your current rank allows. Another viable option is to add additional npcs that give out a certain card. If someone really wants to endure the unique "challenge" that the Random rule offers, then more power to them. However, different players enjoy different rules, for different reasons. It would be nice to have a bit more variety available. The drop rate is a challenge enough.