Ish'neth, Deepcaller

Deathtouch, islandwalk.
Sea Monster spells you cast have affinity for islands. (Serpents, Leviathans, Krakens and Octopuses are Sea Monsters.)
Sacrifice an island : any number of Sea Monsters you control phase out.
Sea Monsters you control can only be
blocked by Sea Monsters or creatures with
islandwalk.