I am with sIKE on this one, kind of. The difference between the Poison Immunity example given and this is that Poison Immunity is a trait and Poison is a damage type, but "Friendly", on the other hand, is not a trait nor an in-built characteristic of a card - it has to do with the context of the game, who controls what. Enchantments falling off as a result of traits I can agree with, but I'm not so sure about the Friendly thing.