This is a variation which may be introduced into any version of Poker.
Mistigris is the "blank" card usually sold with a pack to show its pattern.
This is shuffled with the rest, and the fortunate player to whom it falls
is entitled to "make" it represent any suit and value he pleases. Thus if
he has three sevens and mistigris, mistigris will represent the missing
seven, and make him "fours." In conjunction with two pairs, it makes the
hand a "full." If the player has four hearts and mistigris, he can claim a
flush; and should his four hearts be in sequence, he is considered to hold
a straight flush, the mystic mistigris representing the particular card
required to complete it.