Sokka

You have to use the following abillity, as much as possible.
{3}: Sokka throws his boomerang. Roll a d20.
If you roll a 7 or 17, the boomerang hits all
enemy creatures and kills them. If you roll < 7,
the boomerang kills target creature. If you
roll any other number, Sokka's boomerang
hits yourself and deals damage equal to the
rolled number.