Spreading Virulence

Whenever one or more +1/+1 counters are placed on a creature you control, you may put an infection counter on target creature an opponent controls.
Creatures with infection counters on them get
-X/-X, where X is the number of infection counters on them.
Whilst the mutants and demons rampage across Belenon, insidious disease, a greater foe than the strongest creature of Malacol, takes root in the bodies
of those that fight against them.