Semias, Assassin in the Night

Contract - Any opponent may have you create
three Gold artifact tokens with "Sacrifice this
artifact: Add one mana of any color to your mana
pool." If they do, they choose a creature you
don't control. Semias destroys that creature.
"I am a multifaceted, three-dimensional killing
machine, and I have got a little something for
everyone because contract killing... is a beat we can
all dance to."