The Red Wedding

Players can't gain life.
At the beginning of each player's upkeep, that
player sacrifices a nonland permanent. Whenever
a creature is sacrificed this way, its controller
loses 1 life. Then, if there are no creatures on the
battlefield, sacrifice The Red Wedding.
"Explain to me why it is more noble to kill ten
thousand men in battle than a dozen at dinner."
~ Tywin Lannister