Historical Rules · 27 April 2018
Rule 202.2
Official source text from the 27 April 2018 Rules release
An object is the color or colors of the mana symbols in its mana cost, regardless of the color of its frame.
Historical Rules · 27 April 2018
Official source text from the 27 April 2018 Rules release
An object is the color or colors of the mana symbols in its mana cost, regardless of the color of its frame.