Golgari Ascendancy

{1}{b}{g}: Put the top card of your library into
your graveyard.
Whenever one or more creatures are put into
your graveyard from anywhere other than your
hand, put that many rot counters on Golgari Ascendancy.
At the beginning of your upkeep, if Golgari Ascendancy has 30 or more rot counters on it,
you win the game.