Dirk, Death's Guard-Dog

Menace, infect.
Whenever you would add one or more -1/-1
counters to a creature, put a +1/+1 counter on
Dirk, Death's Guard-Dog.
Whenever you would add one or more poison
counters to a player, put a +1/+1 counter on
Dirk, Death's Guard-Dog.
"Want a skeleton, Dirk? Yes you do! Fetch!"
-Death