Historical Rules · 22 July 2016
Rule 202.2
Official source text from the 22 July 2016 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 · 22 July 2016
Official source text from the 22 July 2016 Rules release
An object is the color or colors of the mana symbols in its mana cost, regardless of the color of its frame.