I like this card.
I think it's as close to a perfect mark change card as it gets. Theme, art, cost, unupped/upped.. everything fits very nicely. I wouldn't change anything, which is pretty rare.
Only issue is the need for the selection menu. I was thinking about alternative, more simple, ways to do it. Maybe the quanta icons on the left would start to glow and you click one to change the mark? Not perfect but it would simplify things a bit because there wouldn't be a need for a separate menu.