Could also just add the feature to make folders in your inventory, still counting the whole as 1 inventory but with subfolders ---> then i have a subfolder binders with binder 1 23 and boxes 1 2 3 and so on... pretty simple.... no need to have tags on a card (that takes a lot mor time when entering the cards....) just add them to a folder of your inventory and if changed switch folder, for cards in decks you have a folder "in deck" and add it to a decklist....
this is the only thing i miss here and the point why im looking for something else before i put a lot of work into this, unless there is fast response to this post 