Historical Rules · 8 June 2018
Rule 202.2
Official source text from the 8 June 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 · 8 June 2018
Official source text from the 8 June 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.