Eater of Worlds

Reach, Trample
Eater of Worlds enters the battlefield with X
+1/+1 counters on it.
When Eater of Worlds would take damage instead
put that many -1/-1 counters on it and create a
Y/Y reach, trample demon worm token where
Y is how much damage Eater of Worlds took.
"Screams echo around you..."