Historical Rules · 12 July 2019
Rule 107.4c
Official source text from the 12 July 2019 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 · 12 July 2019
Official source text from the 12 July 2019 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.