Players don't lose the game for having 0 or less life.
As long as a player has 0 or less life, all damage is dealt to him or her as though its source had infect. (Damage is dealt to that player in the form of poison counters.)
Whenever you roll
, proliferate.
(You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there.)