If you are one of the first three people who get all card sets (at once) then you can win a wii
Right now there are still pets which don't have an owner yet (e.g. the Alma Bomy). The record of pets is currently hold by RevolutionJS both by number of pets and card sets owned at the same time. We have seen that for some sets all cards are in players hands but would need to be traded to get a full set and activate it, so trade more
Cards can now be traded even after activating them.