She sat down and chatted with the young man until the leeches began to just fall off her legs - satiated with blood. The young man, enthralled and disgusted by what he just saw, thanked her and went on his way.
In addition to her general oddity, Myna seems to have issues with common sense.
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.