Quote from Mystic_X »Does this only add multiple mana if you have multiple mono-colored permanents which are different colors, or will this also add multiple mana of one color if you have multiple mono-colored permanents of the same color?
It adds one color for each distinct mono colored Permanent you control, so if you have two mono green cards and one mono red card it can create GR in total.
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Source: Badmanafluence
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(if you ever see me complain about leak image quality this is why)
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Source: Jamie Topples
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Source: Comicbook.com