In Commander, can your commander's color identity include hybrid mana symbols?

A card's color identity in Commander is determined by every mana symbol that appears anywhere on the card — in its mana cost, rules text, or elsewhere. Hybrid mana symbols (like {W/U} or {R/G}) count as both of their colors for color identity purposes. This is explicitly established in Commander rule 903.4 and supported by CR rule 202.2c, which states that a hybrid symbol's colors include all colors it represents.

So if your commander has a hybrid mana symbol such as {B/G} anywhere on the card, your color identity includes both Black and Green, even if every other symbol on the card is a different color or colorless. This can broaden your color identity beyond what the card's converted casting cost might suggest at first glance.

This applies equally to hybrid Phyrexian mana symbols (e.g., {W/P} contributes White) and split cards, where both halves define identity. The rule is deliberately inclusive — any mana symbol anywhere on the card counts.

Concrete example: Suppose your commander is Reaper King, which has the mana cost {2/W}{2/U}{2/B}{2/R}{2/G}. Because each hybrid symbol contributes both its colors, Reaper King's color identity is all five colors — WUBRG — even though you could theoretically cast it spending only colorless and one color of mana. Your deck may include cards of any color.