Oh, of course it's required that you use the Clocktower. It's just that awesome.

And yeah... I only know a bit about the Tarot myself. I've never had the chance to get my hands on a decent enough deck and someone who knows enough about it to teach me properly. It's just a vague interest currently, up there with ritual magic and so forth. Something to look into further when I have money to spend on books and cards and the other tools of the trade.