Text (CH+errata): Creatures you control get +1/+1 as long as you control no nonartifact, nonwhite creatures. [Oracle 2001/08/24]
You get the bonus if all of your creatures are white or artifact even if they also have other colors or qualities. So, if your only creature is a Lord Magnus (a white and green Legend), you would get the bonus. So would a red artifact creature. [Aahz 1994/07/13]
Extended tournaments (see Rule 913) have banned this card since 1999/10/01.
