Sporeling

When Sporeling enters the battlefield or dies, Mold 1 (Put a spore counter on another target creature. That creature has "When this creature dies, create X 1/1 green and black Fungus creature tokens, where X is the number of spore counters on it." For as long as it has a spore counter on it.)
They're fast, but if you can catch them, they make excellent soup.
-Borgus, Wildlife Tracker