Islandwalk (This creature can’t be blocked as long as defending player controls an Island.)
Harbor Serpent can’t attack unless there are five or more Islands on the battlefield.
Like most giant monsters villagers worship as gods, it proves a fickle master.
Harbor Serpent's abilities care about lands with the land type Island, not necessarily lands named Island.
15-08-2010
wotc
The second ability checks how many Islands are on the battlefield (regardless of who controls them) only as attackers are declared. Once Harbor Serpent is declared as an attacker, it will continue to attack even if the number of Islands on the battlefield falls below five.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.