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. Avian Changeling).
 * Devoid makes an object colorless, despite the presence of colored mana in the mana cost (e.g. Touch of the Void).

Other examples are:
 * Transguild Courier is all colors.
 * Veteran Adventurer is also a Cleric, Rogue, Warrior, and Wizard.
 * Boneyard Mycodrax's power and toughness are each equal to the number of other creature cards in your graveyard.

Rules
undefined undefined undefined