Fang, Fearless l'Cie unable to helm a golgari brawl deck
Fang, Fearless l'Cie has a black/green identity on its backside, and therefore should be able to helm a golgari deck.
Reproduce steps:
1. Go to deckbuilding
2. Choose Brawl or Standard Brawl as the format
3. Add Fang, Fearless l'Cie as your commander
4. Unable to add green cards to the deck / Existing green cards are colored as illegal for the deck
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Rezzahan#77802
commented
I think, this rule is responsible for that:
712.4b The back faces of a meld pair are used only to determine the characteristics of the melded
permanent that pair becomes on the battlefield. If a rule or effect references the back face of a
meld card when not part of a melded permanent on the battlefield, it fails to determine its
characteristics, regardless of which parts of the melded permanent is represented on that card’s
back face.The rules for color identity simply cannot reference the back face of a half of a meld pair when not part of a melded permanent.