Given this was two years ago, I doubt anyone's interested (how come nobody talks around here??). But my answer would be, "Any dman thing you want."
Seriously, I use mine to refresh my waning memory and see who's who as in what element they're in. I can't remember all that stuff. I've yet to use them to my advantage regarding levels of power or whatever those level markers mean. Guess I need to figure out what the symbols to the left mean first. ("Yeah, that would help.") I like to go through my cards and gloat at all the little people I have. I enjoy watching my stack of cards grow thicker.
Some folks, I assume, given the 'type' of cards they are, trade them. I could never. I like collecting them too much!