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As Heraldic Banner enters the battlefield, choose a color.
Creatures you control of the chosen color get +1/+0.
{T}: Add one mana of the chosen color.
If there is somehow no chosen color, Heraldic Banner's static ability has no effect, and its mana ability produces no mana if you activate it. Colorless creatures won't get +1/+0, and you won't add {C}.
You must choose white, blue, black, red, or green for Heraldic Banner's ability. You can't choose “multicolor,” “gold,” or “colorless.”
