E.13.1- Effects that change words on cards only change words of the appropriate type used in the appropriate way. For example, Sleight of Mind only changes color words that are being used to indicate a color. It will not affect these words appearing in card names or other contexts. [WotC Rules Team 2002/10/01]
E.13.2- An ability added to a permanent through the use of quoted text does not actually add that quoted text to the card. It adds the ability described by the text. [WotC Rules Team 2002/02/01] This rule means that you cannot alter the text on the affected card using Sleight of Mind and similar cards.
E.13.3- A card with a zero mana cost may specify that it has a color in its card text. This text is considered explanatory and is not an ability. The text is subject to text changing effects such as Sleight of Mind. [CompRules 1999/11/01]
E.13.Ruling.1- You may still use text altering spells and abilities such as from Sleight of Mind. These spells and abilities can be used when there is no text to alter (or when text only exists in a potential form) and once the ability appears (when Threshold is met), the alteration will be applied to the text as it would have been had the text been there the whole time. [Barclay 2001/10/22]