Is Stormtide Leviathan legal in Standard, Modern, and Commander?

Stormtide Leviathan is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Stormtide Leviathan

Q: What type of card is Stormtide Leviathan?

Stormtide Leviathan is a Creature — Leviathan. Its oracle text reads: "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."

Creature — Leviathan

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)<br>All lands are Islands in addition to their other types.<br>Creatures without flying or islandwalk can't attack.

Set Pioneer Masters

Rarity Rare

Artist Karl Kopinski