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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.
2010-08-15 · Wizards of the CoastHarbor Serpent's abilities care about lands with the land type Island, not necessarily lands named Island.
2010-08-15 · Wizards of the Coast
Dungeon Comics & Cards · Condition LP
Hairy Tarantula · Condition MP
401 Games · Condition LP
