Foot Fungus

When Foot Fungus enters the battlefield, Decompose X (To decompose, put X -1/-1 counters on target creature. Then, put X 1/1 green and black Fungus creature tokens with trample onto the battlefield under your control).
Then, the targetted creature's controller puts X 0/1 Foot creature tokens with shroud onto the battlefield.
"Ferociously fast fungus feeds for forever!" - Headline, Mushrooburg Gazette