Deep-Viper Behemoth

Trample, Engorge (At the end of every turn put a
+1/+1 counter on this creature if it dealt damage to
any other creatures this turn).
When Deep-Viper Behemoth enters play it deals
10 damage to one target.
When Deep-Viper Behemoth leaves play it deals
10 damage to you.
{t}: Up to two target islands phase out.