Stormtide Leviathan

Creature — Leviathan    (CMC:8)

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.

407 CMR • ENKarl Kopinski

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

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

Oracle Text (click to copy):

Stormtide Leviathan {5}{U}{U}{U} Creature — Leviathan 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. 8/8

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8/15/2010
Islandwalk cares about lands with the land type Island, not necessarily lands named Island.
8/15/2010
Stormtide Leviathan's second ability causes each land on the battlefield to have the land type Island. Each land thus has the ability to tap to add  to its controller's mana pool. This effect doesn't change anything else about those lands, including their names, other subtypes, other abilities, or whether they're legendary, basic, or snow.
8/15/2010
If Stormtide Leviathan loses its abilities, all lands on the battlefield (including those that enter the battlefield later on) will still be Islands in addition to their other types and will still be able to tap to produce . The way continuous effects work, Stormtide Leviathan's type-changing ability is applied before the effect that removes that ability is applied.
8/15/2010
Stormtide Leviathan's third ability affects all creatures with neither flying nor islandwalk, regardless of who controls them. They can't attack any player or planeswalker.

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