Sporrou, the Larva Mage

Sporrou, the Larva Mage cannot attack or block.
At the beginning of your upkeep, put X +1/+1 counters on Sporrou, where X is the number of creature cards in your graveyard.
{b}{g}, Remove a +1/+1 counter from Sporrou:
Create a 1/1 green and black Worm creature
token with Infect.