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  | This search based on the March 17, 2008 release of the Rulings. 
504 - Face-Down Spells and Permanents 
  504.1 - Two cards (Illusionary Mask and Ixidron) and the morph
    ability (see Rule 502.26) allow spells and permanents to be face down. 
    [CompRules 2006/10/01]
  504.2 - Face-down spells on the stack, face-down permanents in play, and
    face-down cards in the phased-out zone have no characteristics other than
    those listed by the ability or rules that allowed the card, spell, or
    permanent to be turned face down.  Any listed characteristics are the
    copiable values of that object's characteristics.  (See
    Rule 418.5, "Interaction of Continuous Effects," and Rule 503, "Copying
    Objects.")  Objects that are put into play face down are turned face down
    before they come into play, so the permanent's comes-into-play abilities
    won't trigger (if triggered) or have any effect (if static).  Objects that
    are played face down are turned face down before they are put onto the
    stack, so effects that care about the characteristics of a spell will see
    only the face-down spell's characteristics.  Any effects or prohibitions
    that would apply to playing an object with these characteristics (and not
    the face-up object's characteristics) are applied to playing this object.
    [CompRules 2007/05/01]
  504.3 - At any time, you may look at a face-down spell you control on the
    stack, a face-down permanent you control, or a face-down card in the
    phased-out zone you controlled when it phased out.  You can't look at
    face-down cards in any other zone, face-down spells or permanents
    controlled by another player, or face-down cards in the phased-out zone
    last controlled by another player.  The ability or rules that allow a
    permanent to be face down may also allow the permanent's controller to
    turn it face up.  Spells normally can't be turned face up.
    [CompRules 2005/08/01]
  504.4 - If you control multiple face-down spells on the stack or face-down
    permanents in play, you must ensure at all times that your face-down
    spells and permanents can be easily differentiated from each other.  This
    includes, but is not limited to, knowing the order spells were played, the
    order that face-down permanents came into play, which creature attacked
    last turn, and any other differences between face-down spells or
    permanents.  Common methods for distinguishing between face-down objects
    include using counters or dice to mark the different objects, or clearly
    placing those objects in order on the table. [CompRules 2003/07/01]
  504.5 - As a face-down permanent is turned face up, its copiable values
    revert to its normal copiable values.  Any effects that have been applied
    to the face-down permanent still apply to the face-up permanent.  Any
    abilities relating to the permanent coming into play don't trigger and
    don't have any effect, because the permanent has already come into play.
    [CompRules 2003/07/01]
  504.6 - If a face-down permanent moves from the in-play zone to any zone
    other than the phased-out zone, its owner must reveal it to all players as
    he or she moves it.  If a phased-out face-down object moves to any zone
    other than the in-play zone, its owner must reveal it as he or she moves
    it.  If a face-down spell moves from the stack to any zone other than the
    in-play zone, its owner must reveal it to all players as he or she moves
    it.  At the end of each game, all face-down objects in play, in the
    phased-out zone, or on the stack must be revealed to all players. 
    [CompRules 2003/07/01]
  504.7 - If a face-down permanent becomes a copy of another permanent, its
    copiable values become the copiable values of that permanent, as modified
    by its face-down status.  Its characteristics therefore remain the same:
    the characteristics listed by the ability or rules that allowed it to be
    turned face down.  However, if it is turned face up, its copiable values
    become the values it copied from the other permanent.
    [CompRules 2006/05/01]
  504.8 - If a face-down permanent would have an "As [this permanent] is
    turned face up ..." ability after it's turned face up, that ability is
    applied while that permanent is being turned face up, not afterward.
    [CompRules 2006/10/01]
    
    
    This search based on the March 17, 2008 release of the Rulings.
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