Another detail que has already been discussed, about by encourage interest by duels, give icons awards for 4° - 6° places, may be a single icon lower with the description "top 6" ,I think to be in top 6, it is also very difficult.
And I am in favor of an alternative league, where we can use cards upgraded limited, as in the event, the player can choose a card (except pillars and pendulums) and use them 6 upgraded, if no codes mark / nymph, can be only be icons awards, and also that it be free league where CL and BL players can be found.