Carl Mach, Infectious Phage

Vigilance

Whenever Carl Mach, Infectious Phage deals
combat damage to a creature, put a -1/-1 counter on
that creature.

At the beginning of your end step, if a creature an
opponent controls has a -1/-1 counter on it, create a
1/1 green and white Symbiote creature token with
lifelink and Toxic 1.
Infection spreads with every touch