Roshan, the returning soul

Flying, trample
Whenever this creature becomes the target of
a spell or ability for the first time each turn,
counter that spell or ability.
Sacrifice a creature: Put a -1/-1 counter on each
other creature in play.
Whenever a creature dies, its controller loses life
equal to the number of -1/-1 counter on it.
"Cursed to suffer his misdeed forever"