I have just added the "maximum age" filter I described above to the deck tutor. @Yaochecka
@hay0004, I will look into adding a way to filter to a specific rotation/season as well. For now, you should be able to achieve something like this using the age filter. If you set that to 30 days or so you should only get post-rotation decks, since very few people will have uploaded a deck for an older rotation recently.