The yang and yin team of Connor, the Urban Paladin, and Heather, The Mystic Cleric, is very effective as his pragmatism is balance by her optimism, her enthusiasm and idealism are tempered by his cautious paranoia, his wounds are healed by her, and she is kept alive by his sword. This effectiveness aside, Connor and Heather are not your normal adventurous members of The Church. Nor are they a couple.
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.