Dug, the Fish

Islandwalk, Forestwalk
Whenever you cast a fish, put two {e} counters on Dug, the Fish.
{x}{5}{u}{u}{u}{u}{u}{g}{g}{g}{g}{g}{t} Put {x} {e} counters on Dug, the Fish.
When Dug, the Fish has 20 {e} counters, remove them and destroy all permanents your opponents control.