We will make it a real holiday.
But seriously, this is a chance to reach a lot of people. You've got your usual webcomic readers, but also your collectors and your mystics and your tabletop gamers. There's no shortage of new and traditional games that use Tarot cards (but I'm wondering if there isn't a way to use them as replacements for gaming dice.)
I've been reading the cards for over a decade so I can offer my services as a consultant. The deck will most likely be a standard Rider-Waite clone but I'm here to explain the symbolism.
The first thing you need to know is that every Tarot deck is divided into two parts. There's the 22-card Major Arcana, which contains all the cards that movies get wrong, like "Death" and "The Devil" and "The Lovers."
There's also the 56-card Minor Arcana, which is much like a regular deck of cards. As with playing cards there are four suits: wands, pentacles, swords, and cups, which correspond with both the suits of clubs, diamonds, spades, and hearts and also the elements of fire, earth, air, and water. As with playing cards, each Tarot suit has cards that go from ace to ten. Each suit also has a page, a knight, a queen, and a king.