Dr. Mundo, Zaun Madman

Lifelink, Shroud, Trample
Whenever Dr. Mundo blocks or becomes blocked by a creature, Dr. Mundo deals 1 damage to that creature.
Remove a +1/+1 counter from Dr. Mundo: Dr. Mundo deals 1 damage to target creature.
At the end of your turn, put a +1/+1 counter on Dr. Mundo.