Radstorm

Each player and each creature gets a rad counter.
If a player or creature already has a rad counter
on it, it gets an additional rad counter.
(Nonmutant humans with rad counters get -1/-0 for
each counter; if a nonmutant human has a number of
rad counters equal to or greater than its mana value,
its controller exiles it and creates a 2/2 green mutant
human creature token. If a player has a number of
rad counters equal to their life, they lose the game.)
Proliferate.