Historical Rules · 28 April 2017
Rule 202.2
Official source text from the 28 April 2017 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 · 28 April 2017
Official source text from the 28 April 2017 Rules release
An object is the color or colors of the mana symbols in its mana cost, regardless of the color of its frame.