Sassa, Bubonic doctor

Whenever a creture dies, its controller receive
poison counters equal to its thoughness.
pay 2 life:remove a poison counter from target
player, any player may activate this ability
{1}{b}{g}, remove 2 poison counters you have
and pay 4 life:creature your oponents have get
-X/-X until end of the turn, where X is the number
of poison counters you have plus 1
{b}{g}{t}, sacrifice a creature:gain 1 life and draw a
card for each poison counter you have