Historical Rules · 28 April 2017
Rule 107.4c
Official source text from the 28 April 2017 Rules release
The colorless mana symbol {C} is used to represent one colorless mana, and also to represent a cost that can be paid only with one colorless mana.
Historical Rules · 28 April 2017
Official source text from the 28 April 2017 Rules release
The colorless mana symbol {C} is used to represent one colorless mana, and also to represent a cost that can be paid only with one colorless mana.