Of the tarot, both it and the regular card deck seem to have a parallel and interlinked history that dates back to Europe of the 1400s to 1500s. From there, there are All sorts of speculations and stated origins, all of which are outside the scope or interest of this paper, although I will note that Oh Boy do some of the websites I've seen get Really Thick with How Deeply Symbolic and Magickally Greatly SigNificant They All Are . . .
At any rate, there Are a number of points which seem to be universally agreed upon, or at least a look at a number of decks, both tarot and regular play, do make them obvious.
The regular playing deck is made of four suits of 13 cards each, for the total of 52. The suits are hearts, spades, diamonds, and clubs, and within each suit, the cards start with the ace and then the two, and continue up to the ten and the jack, queen, and king. In varying games, the ace can be the supreme card or be rated below the two, which suit is being played can have significance to the play of the game, and so forth as the deck gets used for its primary use as a means of playing games.
Of the basic tarot deck, One of its stated origins is as merely a playing card variation, but in modern times, the primary use is of a method of divination where there almost seems to be about as many variations in placement and interpretation as there are practitioners. Almost.
       
    The tarot deck itself is divided into two groups of cards, called the minor
    and major arcanas.  The minor is made of four suits of 14 cards each, where
    the suits are 1) wands, staffs, or batons, 2) cups, 3) swords, and 4)
    pentacles, or
    coins, and where the regular card deck's Jack, Queen, and King are replaced
    by the tarot deck's Page, Knight, Queen and King.  The major arcana is a
    series of 22 individual cards that represent historical and legendary
    archetypes that begins with the unnumbered Fool and the Magician, number 1,
    and finishes with Judgment and The World, numbers 20 and 21.
     
       
    As the four minor suits in the tarot deck consist of 14 cards each, then  
    following The Fool, which shall stand alone, the first 14 numbered cards of
    the major arcana, from The Magician to Temperance, number 14, then become a
    fifth, major, suit. Once dealt, a major suit card may not be discarded,
    except to a personal discard pile.  There is no general discard pile, even
    if a player folds, in which case the players hand is simply kept separate
    or added to the personal discard pile.  After the game, all discarded cards
    are turned face up in order of discarding, because another player may win
    the game because of them.   
       
    The remaining eight major cards, from The Devil, number 15, to The World, 
    number 
    21, and The Fool, not only rank incrementally higher than the major suit 
    cards, but become the influence cards, with influences of their own which  
    last for the duration of the game.   Of these influence cards, they cannot   
    be discarded at all; if a player is required to discard, and the player 
    holds Only influence cards, then that player must fold.  No influence 
    supercedes
    any other influence, they just all pile on top of each other.   
        
    In play, the minor cards are played as normal.  Of the major cards, they
    take precedence over the minor cards, and their influence affects the
    entire game when dealt face up on the table.   When held by a player, the
    influence affects only that player, and, if need be, the winner of the game
    is revealed at the end of the game as each player displays the cards still
    held.  And in this case of tarot as game deck, upright vs upside-down 
    placement of a face up card is ignored, as the point of view of the players
    will shift. 
       
    Of play with the five suits, the only change is in increment; where four of
    a kind in games like poker becomes five of a kind.  In games like seven
    card stud poker, where seven cards are dealt instead of the usual five, two
    threes of a kind, or two sets of three identical cards, wins over a single
    three of a kind.  Of the majors taking precedence, a hand that relies on
    two major cards wins over a hand that relies on one, a flush made of major
    cards beats a flush that is made of minor cards, and so forth.  
       
    The major card influences are as follows;  
       
    0; the Fool;   When dealt face up, the game ends immediately and the card 
    source, whether one or more decks, is reshuffled.  All bets that are
    current go to the one who has recieved the Fool.  When dealt to a player and held, play of the
    other players continues for a full game, but the player with the card wins
    the game.  
       
    15; The Devil;    All players affected by this card will have all major
    cards except The Devil become null and valueless in numerical value.  Thus,
    when a player is dealt one minor card, three majors, and The Devil, the
    player begins the game with two playable cards. 
       
    16 The Tower;   All players affected by it will have their highest minor
    card go to the left, while the lowest minor card of the player to the left
    goes to the right.---The player with five cards in a straight flush who    
    sits to the left of the player who is dealt The Tower Is Screwed. 
        
    17; The Star;   For any player influenced by this card, all minor cards
    have the value of major suit cards. 
       
    18; The Moon;   This card becomes any suit card the player wishes, as does 
    one other card that the player holds or is in play on the table, except any
    influence cards and only for that player.  
        
    19; The Sun;   For any player influenced by this card, all suit cards 
    increase by one number, except the King. 
       
    20; Judgment;   For any player influenced by this card, no cards are held
    and all cards are played face up. 
       
    21; The World;   Following the end of all other play, any player affected    
    by this card is allowed to be dealt one more card which is then factored   
    into that players score.  
       
    To sum up the influence cards, in a game of seven card stud poker, the
    player who is dealt all seven influence cards other than The Fool gets all
    seven influences;  
       
    The Devil, number 15,  makes all these cards but itself valueless.      
       
    The World, number 21, allows the player to receive one more card, at the
    end of the game, after everyone is entirely finished playing.   
       
    The Star, number 17, will give that additional card the precedence of a
    major suit card, if it is a minor suit card.  
       
    The Sun, number 19, will increase that dealt minor card by one more number. 
       
    The Moon, number 18, makes that card any suit card the player wishes.   
       
    The Tower, number 16, sends any minor card that is so dealt to the left, as
    it will be the highest card of value, and that card will be added to the  
    left hand player's score---or subtracted, as the player to the left did Not
    receive The World and thus does Not get an extra card as that players  
    lowest card gets handed to the right.   
       
    Of course that card being taken from the influence of the cards that made
    it so valuable makes it revert back to its face value for the receiving
    player.    
       
    And Judgment, number 20, places All these cards face up for the duration of
    the game which Does have to be played through by the other players before
    that final card can be dealt. 
       
    If no other player has any hand of value, the point count of 15 for The
    Devil wins that game.  If that extra card that is dealt is The Fool, while
    it has a value of nothing, it is a major card and cannot be handed off to
    the left, and as its influence is just as powerful as the rest of the  
    influence cards, it wins the game for that player regardless of the other
    hands. 
       
      
       
           
       
    
    
    
     
    ©  Temujin Felix MacAvity