Twisted Sewer-Witch

When Twisted Sewer-Witch enters the battlefield, create a 1/1 black Rat creature
token with "This creature can't block." Then
for each Rat you control, create a Wicked Role
token attached to that Rat. (If you control
another Role on it, put that one into the
graveyard. Enchanted creature gets +1/+1.
When this Aura is put into a graveyard, each opponent loses 1 life.)