Dr. Mundo, Madman of Zaun

Happy Madness—When Dr. Mundo, Madman of Zaun is dealt damage by a creature, put a Madness counter on that creature.
Creatures with Madness counters on them get -1/-1 for each Madness counter on them.

Embigenate—{2}{b}{g}: Remove all Madness counters from creatures your opponents control. For each counter removed this way, Dr. Mundo gets +0/+3 until end of turn. When you activate this ability, Dr. Mundo can block any number of creatures this turn. Whenever Dr. Mundo is dealt dam