Eater of Worlds

When Eater of Worlds enters the battlefield,
Devour X, where X is the number of creatures devoured this way.
Whenever Eater of Worlds is dealt damage,
remove that many +1/+1 counters from it
instead, then create a copy of Eater of Worlds,
except it isn't a legendary, with that many +1/+1
counters on it. If Eater of Worlds is dealt damage
equal to or greater than its toughness, ignore this effect.