Melisandre, the Red Woman

{t}: Tap a Legendary creature you control, then
create a black Legendary Horror creature token
named Servant of the Light with base power,
toughness and abilities equals to that Legendary
creature. It also has "Whenever this creature
deals combat damage to a player, sacrifice this
creature and that player loses the game."
Partner
"For the night is dark and full of terrors."