In some of the methods of fortune-telling by cards it is essential to
have a special card as the representative of the party seeking the
response of the oracle. This is commonly called the "Consultant." If
there is a joker in your pack, or an extra blank card, as is the case
in many packs, use one of them as the Consultant, marking this card to
show which is its top, as its reversal has its own signification. If
there is neither joker nor blank card, use the discarded deuce of
either suit in the pack, with a mark at its top end.