Bearsharktopus

Bearsharktopus can't attack unless defending player controls an Island.
{1}{u}{g}: Monstrosity 1. (If this creature isn't monstrous, put one +1/+1 counter on it and it becomes monstrous.)
When Bearsharktopus becomes monstrous, put a +1/+1 counter on each other bear, put a +1/+1 counter on each other fish, and put a +1/+1 counter on each other octopus.