Dagon, Scale-Covered Scourge

Menace, Islandwalk (This creature is unblockable as
long as defending player controls an Island.)
When Dagon, Scale-Covered Scourge enters the battlefield, create X 1/1 blue Fish creature tokens,
where X is the amount of Islands you control.
Other Fish creatures you control get +1/+1 for each
Fish creature on the battlefield.
Disaster Tides — {3}{u}, {t}: Target creature gets
-1/-1 for each Island you control.