Just curious how the rest of the community feels on this topic. For something to be considered "tribal" does that mean all creatures have to have that type? What about the shapeshifters or the "this is all creature types" type cards? What about something that is out of flavor? For example, a Mark of the Vampire in a tribal pirates deck?

This doesn't really mean anything in the scope of the game, but was just curious on other's thoughts. I personally try not to include a "vampire" type card in a pirate deck, at the detriment to competitiveness and was just curious where everyone else drew the line. Obviously this is in the casual forum for a reason.