Is Shelldock Isle legal in Standard, Modern, and Commander?

Shelldock Isle is legal in: Modern, Legacy, Vintage, Commander, Historic.

Shelldock Isle

Q: What type of card is Shelldock Isle?

Shelldock Isle is a Land. Its oracle text reads: "Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) This land enters tapped. {T}: Add {U}. {U}, {T}: You may play the exiled card without paying its mana cost if a library has twenty or fewer cards in it."

Land

Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)

This land enters tapped.

: Add .