text: The game continually counts the number of nontoken permanents of each color the chosen player controls. Multicolored ones are counted for each of their colors; colorless ones are ignored. The moment the number of nontoken permanents of the chosen color that player controls is less than or equal to the number of permanents of one of the other colors that player controls, Call to Arms’s second ability stops giving white creatures +1/+1 and its third ability triggers. Call to Arms will be sacrificed when the third ability resolves, even if those numbers have changed by then.