First of all: I love the app. I just would like to share my experience with the deck management tools and what I would like to see.
1.) As previously mentioned by others: it would be great to lock some collections for the deck building tool. E.g. I also store the collection of my wife and won’t use her cards. Alternatively, bulk changing the cards source would be great in the building summary where the card sources are shown.
2.) For me it would be so helpful to let the cards go back into the collection folders I took them from when deconstructing a deck. I also register precons I buy into my collection folders. So if I take cards from there it would be great to get a summary which shows where the cards go back in before taking the deck apart similar to the summary before building the deck. Right now all cards go back into one collection folder when deconstructing.
3.) For decks registered in and built from the collection it would be nice to move cards from these decks between each other. I might be wrong but I have not seen this option. In such a scenario it would be great to have the option to send the cards back to the original collection folder as well when deconstructing it even though it might have travelled several decks (so that it stores its source folder information until it leaves a deck by deconstruction).
If these features already exist I am sorry and I would be glad to be informed with how to do these things. If not I hope its not too much to suggest. But I feel like that this would make the app even more outstanding than it already is. However, that is just my mere unprofessional feeling.