Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Colour identity is not only the colours in the casting cost, but any mana symbols that appear in the rules text (but not the reminder text!). Are there any legendary creatures that have a different colour identity to their card colour?
There are. The color identity rules were purposefully changed in 2010 to allow these legendary creatures to be played as commanders:
Required, but never shown