Legendary Creature - Human Assassin
When Massacre Girl enters the battlefield, each other creature gets -1/-1 until end of turn. Whenever a creature dies this turn, each creature other than Massacre Girl gets -1/-1 until end of turn.
I hate the name on this, but just LOVE the flavor. Might be useful in Modern and Legacy only. Noble, Thalia, Deathrite, Trygon in play? All die one by one. Love it. This is more a flavor post than anything