Nergigante, Dragon's Ruin

Flying
Devour 2(As this creature enters the
battlefield, you may sacrifice any number
of creatures. This creature enters the
battlefield with twice that many
+1/+1 counters on it)
Whenever Nergigante Dragon's Ruin attacks
or dies, it deals {x} damage to each opponent,
where {x} is the number of +1/+1 counters on it.