??
Do you mean myths associated with the use/origins of Tarot itself, or myths associated with individual cards eg. The Hanged Man and Odin?
If the former, I have a couple of suggestions.
a) That old chestnut about not being able to start Taroting until someone gives you a deck.
b) That Tarot and Witchcraft are inextricably linked and everyone who reads Tarot is a Witch and vice-versa.
c) That Tarot is associated with "telling the future" and as such is a "sin" for its links to gambling (in lotteries and in broader terms).
d) I also get the sh*^s with people whose lack of imagination means that their idea of the potential use of Tarot is limited to romance and relationships and who look to Tarot for easy answers without the conviction and true desire to make real and lasting changes in their lives, their personalities and their hearts. I guess that's a little off topic, but there you have it.
Then there are little personal preferences that come (I suspect) from dubious publications touting the mystical overtones of Tarot practice. These are PERSONAL PREFERENCES and whilst I don't subscribe to most of them, even I have my little idiosyncrasies. Mostly, though, I think they're rubbish. I am, however, open to ideas and justifications. Eg.
a) black silk cloth to wrap cards in to "keep out negative energies". Keep them in whatever the hell you want! An old sock will do! I personally like pretty tarot bags - the one I got from baba studio for my VR deck is just lovely - because I like pretty things and I treat my cards in such a way as to heighten my own mindspace when I use them. Pretty bags help me, not them.
b) Cleansing. One of my pet hates. They're brand new and fresh out of the cellophane and yet people still feel the need to "cleanse" them. Ugh!
c) Not letting other people touch your cards. If I'm reading face to face for someone, I think I'd be mad not to let them at least shuffle the cards!
d) Not letting other people read with your cards. This one, I believe in. What can I say - I'm territorial!
Can't think of any more right now, and you veterans will probably know heaps more than I do, but thought I'd put in my two cents (oh, sorry, five cents, no more ones or twos here any more!)
\m/ Kat