Grim Myr

Indestructable, trample.
"{b}{b}{b}{b}{b}{p/b}{t}: Destroy target creature.
"{p/b}{t}: Put one +1/+1 counter on Grim Myr. When
Grim Myr dies, put X 1/2 Corrupted Myrling tokens into play where
X is the amount of +1/+1 counters on Grim Myr.
One dies, and more spawn. This is the way of the Grim Myr.