Bones of the Flat-Wurm

Whenever a non-Wurm creature enters the
battlefield under your control put X+2
+1/+1 counters on that creature where X is
the number of flesh counters on Bones of
the Flat-Wurm.
Whenever a Wurm dies its controller gains
4 life. Put a flesh counter on Bones of the
Flat-Wurm.