The cards are distinguished by a gradient frame with those two colors. ... An object with two or more colors is multicolored. Multicolored is not a color. See rule 105, “Colors,” and rule 202, “Mana Cost and Color.”

Does protection from a color include multicolored?

24, 2020): One rule was renumbered with Commander Legends. A multicolor card that's green and blue is fully green and fully blue. Protection from blue will fully work against it, because it is a blue card. The creature with protection can't be targeted, enchanted, damaged or blocked by it.

Are Gold cards both colors?

Gold cards are multicolored. The Helm will work on both of those creatures. There's no such thing as a "gold" card. The gold frame exists just to make it obvious to new players that multicolored cards aren't just one color.