OMG!
I love the deck export/import feature. It's just pure awesome. Definitely something that should have been implemented. Very clever usage of it to make swapping decks interesting. As for the code, is it possible to make it more user friendly for editing? I mean, perhaps I might prefer to type out the deck I want instead of click it. Typing out USD for upgraded sundial or UDS for upgraded dimension shield would allow me to construct a deck purely in notepad and bypass clicking it. Unless someone wants to construct a list of the cards and their codes.
Indeed a good step forward. *applauds*