Massacre Girl, Rakdos Acrobat

Menace
Throw Knives - When Massacre Girl, Rakdos
Acrobat enters the battlefield, up to three target creatures get -X/-X until end of turn, where X is
your devotion to black.
Cut Down - Whenever a creature an opponent controls dies, if its power was less than it's base
power, put a +1/+1 counter on Massacre Girl,
Rakdos Acrobat.
"Watch your back - ha, got your front!"