Harbor Serpent

Creature — Serpent    (CMC:6)

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.

56 M11 • ENDaarken

™ & © 1993—2010 Wizards of the Coast

Legal in: Modern,Extended,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Harbor Serpent {4}{U}{U} Creature — Serpent 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. 5/5

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8/15/2010
Harbor Serpent's abilities care about lands with the land type Island, not necessarily lands named Island.
8/15/2010
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.

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