This is from an unusual Tarot deck called "Morgan's Tarot." It is not an "orthodox" tarot system with the usual cards…kind of an "underground" thing popular in a very limited circle years ago.
For this exercise, it's very simple: just pick a card and reflect on it. Think about how (if at all) it is relevant for you:
http://www.sleepbot.com/morgan/cgi/morgpick.cgi
You can read more about the system itself at the main page:
http://www.sleepbot.com/morgan/index_h.html
Disclaimer: I'm not affiliated with this site in any way, I just think it's cool. I pick one every now and then.