Yeah, I often find out about it in threads (such as at the end of the previous event) where someone says "Such and such a card is the best in the game for F2P!" and I go upgrade it. But it requires that you be paying attention to / reading all the threads to find those little gems, unfortunately. The wiki posted earlier is nice in that it lets me go down through the list and at least categorize them myself. But I noted that one of them (the new lacrosse player) doesn't have an SED.