If this bug gets upgraded into a feature then it should at least be implemented right. It creates all kind of weird visual bugs when you bring the card to parts of the screen where cards are not supposed to be (check the screenshot in my report, for example) and it gets really annoying, when you forget your mouse over a spark or a sundial and hit space. Like antiaverage said, it should disappear upon clicking and I don't think the card should keep moving around, following your mouse.