Julius, Death Spreader

Virulent (Whenever this creature deals damage to
another creature, put a virus counter if it doesn't have
one. That creature becomes Virulent)
Whenever a virus counter is put onto a creature,
put a -1/-1 counter onto it.
Whenever a creature with a virus counter on it
dies, it's controller loses 3 life.
"This world shall become peaceful once all life has
gone silent." - Julius