It would be really cool if you could view the entire collection of cards with the cards you don't have greyed out but still shown so you can see what you are missing and then obtained cards would be coloured in, also then being able to filter the entire league collection by things like team, class rarity so you can see what your missing from series you're trying to collect.
Re-reading that I realise I have worded it really really poorly, but I am tired and I think you will get what I mean.
Thanks for all your hard work, the system and cards are awesome!