Mossfang Mother

Infect (This creature deals damage to creatures in
the form of -1/-1 counters and to players in the form
of poison counters.)
{1}{g},{t}: Create a 0/2 green egg sac creature
token with "At the beginning of your upkeep, if
an egg sac creature token has 3 Hatch counters
on it, sacrifice it. Then, create a 2/3 spider
hatchling creature token with infect."