There are few places more treacherous than pools of quicksand save for a sea of quicksand. Those who tread here quickly find that the lust for adventure or coin might leave them with a sinking feeling of despair.
I dream of rain; I dream of gardens in the desert sand
--Sting, Desert Rose
The wastes are cruel, and beneath the desolation they hide many secrets.
The Ocadian Desert is a desolate place. The spirit of the land has been crushed, changing the region from a series of islands with evergreen forests and animals in a shallow sea, to one of the most inhospitable places on the Sphere.
Tarot Cards are used by Magic folks to predict the future (cartomancy). Since the present becomes the future through the interplay of elementally alligned forces, the tumble of cards can give clues to the way the pattern of elements will be in the future.
This means a wizard will have a deck of cards with them. Since cards were used to train wizards in legerdemain, Since they have cards with them, they frequently know how to use them. Guild magic users often have a knack for fancy shuffles, palming cards, and a variety of card tricks and games.