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  | This search based on the March 17, 2008 release of the Rulings. 
506 - Subgames 
  506.1 - Some cards allow players to play a Magic subgame.
    [CompRules 2007/07/13]
  506.1a - A "subgame" is a completely separate Magic game created by a card's
    effect.  The "main game" is the game in which the spell or ability that
    created the subgame was played.  The main game is temporarily discontinued
    while the subgame is in progress.  It resumes when the subgame ends.
    [CompRules 2007/07/13]
  506.1b - No effects or definitions created in either the main game or the
    subgame have any meaning in the other, except as defined by the effect
    that created the subgame.  For example, the effect may say that something
    happens in the main game to the winner or loser of the subgame.
    [CompRules 2007/07/13]
  506.2 - As the subgame starts, an entirely new set of game zones is created.
    Each player takes all the cards in his or her main-game library, moves
    them to his or her subgame library, and shuffles them.  No other cards in
    a main-game zone are moved to their corresponding subgame zone.  Randomly
    determine which player goes first.  The subgame proceeds like a normal
    game, following all other rules in Rule 101, "Starting the Game."
    [CompRules 2007/07/13]
  506.3 - Any rules regarding the size of a player's deck are ignored for the
    subgame.  However, because each player draws seven cards when a game
    begins, any player with fewer than seven cards in his or her deck will
    lose the subgame when state-based effects are checked during the upkeep
    step of the first turn, regardless of any mulligans that player
    takes.  (See Rule 420, "State-Based Effects.") [CompRules 2007/07/13]
  506.4 - All objects in the main game and all cards outside the main game are
    considered outside the subgame (except those specifically brought into the
    subgame).  All players not currently in the subgame are considered outside
    the subgame. [CompRules 2007/07/13]
  506.4a - Some effects can bring cards into a game from outside of it.  If a
    card is brought into a subgame from a main game, abilities in the main
    game that trigger on objects leaving a main-game zone will trigger, but
    they won't be put onto the stack until the main game resumes.
    [CompRules 2007/07/13]
  506.5 - At the end of a subgame, each player puts all cards he or she owns
    that are in the subgame into his or her library in the main game, then
    shuffles them.  This includes cards in the subgame's removed-from-the-game
    zone.  (This is a change from previous rules.)  All other objects in the
    subgame cease to exist, as do the zones created for the subgame.  The main
    game continues from the point at which it was discontinued: First, the
    spell or ability that created the subgame finishes resolving, even if it
    was created by a spell card that's no longer on the stack.  Then, if any
    main-game abilities triggered while the subgame was in progress due to
    cards being removed from the main game, those abilities are put onto the
    stack. [CompRules 2007/07/13]
  506.6 - A subgame can be created within a subgame.  The existing subgame
    becomes the main game in relation to the new subgame.
    [CompRules 2007/07/13]
    
    
    This search based on the March 17, 2008 release of the Rulings.
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