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  | This search based on the March 17, 2008 release of the Rulings. 
407 - Adding and Removing Abilities 
  407.1 - Effects can add or remove abilities of objects.  An effect that adds
    an ability will state that the object "gains" or "has" that ability.  An
    effect that removes an ability will state that the object "loses" that
    ability.  If two or more effects add and remove the same ability, in
    general the most recent one prevails.  (See Rule 418.5, "Interaction of
    Continuous Effects.") [CompRules 2003/07/01]
  407.2 - An effect that sets an object's characteristic, or simply states a
    quality of that object, is different from an ability granted by an effect.
    When an object "gains" or "has" an ability, that ability can be removed by
    another effect.  If an effect defines a characteristic of the 
    object ("[permanent] is [characteristic value]"), it's not granting an
    ability. (See Rule 405.2.)  [CompRules 2003/07/01]
    Example: An effect reads, "Enchanted creature has 'This creature is an
    artifact creature.'"  This effect grants an ability to the creature that
    can be removed by other effects.  Another effect reads, "Enchanted
    creature is an artifact creature."  This effect simply defines a
    characteristic of the creature.  It doesn't grant an ability, so effects
    that would cause the creature to lose its abilities wouldn't cause the
    enchanted creature to stop being an artifact.  [CompRules 2003/10/01]
  407.3 - Effects that remove an ability remove all instances of it.
    Example: If a creature with flying is enchanted with Flight, it has two
    instances of the flying ability.  A single effect that reads "Target
    creature loses flying" will remove both. [CompRules 2003/07/01]
    
    
    This search based on the March 17, 2008 release of the Rulings.
 
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