In trying out EDH for the first time last night we ran into a confusing issue. I was using Olivia Voldaren as my commander.
One opponent activated Ajani Goldmane's 6 point ability to summon a white avatar creature, which I then used Olivia to vampire and steal. I think this is okay because despite being white the avatar wouldn't have any non-black, non-red dots on the face.
I then wanted to steal another one of his creatures that was white and had white mana on the face, but I wasn't sure if this was allowed.
So in EDH, I know that I can't construct my deck with cards outside of my commander's colour identity, but does this stop me taking control of creatures outside of my colour range?