UEFA champions league draw: Why Manchester City group is the group of death?

Machester City face tough opponents on their champion league debut, it could be a group of death.
Manchester City has been drawn alongside Bayern Munich, Villarreal and Napoli in Group A for champions league in group stage. It is the toughest group as Bayern Munich, 4 times UEFA champions and finalist two seasons ago, will be fighting to reach the champions league final which will be place at