Stormtide Leviathan (M15) from Magic 2015, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Karl Kopinski
• Card Text:
  Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
  All lands are Islands in addition to their other types.
  Creatures without flying or islandwalk can't attack.