Characteristic-defining ability

A characteristic-defining ability is a kind of static ability that conveys information about an object's characteristics that would normally be found elsewhere on that object (such as in its mana cost, type line, or power/toughness box).
Characteristic-defining abilities are noteworthy because they are active at all times, even while not in play or outside of the game. 
Characteristic-defining keywords are:
*Changeling grants every creature type (e.g. <c>Avian Changeling</c>).
*Devoid makes an object colorless, despite the presence of colored mana in the mana cost (e.g. <c>Touch of the Void</c>).
Other examples are:
*<c>Transguild Courier</c> is all colors.
*<c>Veteran Adventurer</c> is also a Cleric, Rogue, Warrior, and Wizard.
*<c>Boneyard Mycodrax</c>'s power and toughness are each equal to the number of other creature cards in your graveyard.
==Rules==
==References==