Historical Rules · 1 November 2013
Rule 700.5
Official source text from the 1 November 2013 Rules release
A player's devotion to [color] is equal to the number of mana symbols of that color among the mana costs of permanents that player controls.
Historical Rules · 1 November 2013
Official source text from the 1 November 2013 Rules release
A player's devotion to [color] is equal to the number of mana symbols of that color among the mana costs of permanents that player controls.