Harbor Serpent Tweet NM-Mint, English, limit 2 $0.01 / $0.01 credit Buy This Product Details Color: Blue Card Text: Islandwalk (This creature is unblockable as long as defending player controls an Island.)Harbor Serpent can't attack unless there are five or more Islands on the battlefield. Rarity: C Cost: 4UU Pow/Tgh: 5/5 Card Type: Creature - Serpent Name: Harbor Serpent Finish: Regular Set Name: Magic 2012