Sith Assassin

First Strike
Hatred-When Sith Assassin enters the battlefield, if an opponent lost life from a source other than combat damage this turn, destroy target creature.
"It is a different war these Sith wage, a thing of silence and shadow. They strike from the darkness, hiding from the face of the galaxy, until all Jedi are exterminated."
Darth Traya, Lady of Betrayal