I suggested this to my wife and she thought it was a good idea. We play with all of the expansions, which means that we have 483 Adventure Cards in play. This means that some of our favorite items (for me, the Runesword; for her, the Maiden and the Unicorn) almost never show up.
We are going to try separating some of those cards out into a separate deck. Then when we trade in trophy points we can choose either to take a strength/craft bonus OR draw from that other deck.
I'm thinking we'll make it that you have to trade in ten trophy points to draw from the deck.