"If you have a Digimon with [Three Musketeers] in its type in play, you may use this Option card without meeting its color requirements.” How does this effect work, exactly?
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Official Ruling
If you have a Digimon with [Three Musketeers] in its type in play in your battle area, you can use this Option card even if you don’t have a purple Digimon or Tamer in play.
Source: BT6-109 Fly Bullet