Shelldock Isle

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.

Secret Lair Drop

The List

Lorwyn

Hideaway (This land comes into play tapped. When it does, look at the top four cards of your library, remove one from the game face down, then put the rest on the bottom of your library.)
{T}: Add {U} to your mana pool.
{U}, {T}: You may play the removed card without paying its mana cost if a library has twenty or fewer cards in it.

It doesn't matter which library has twenty or fewer cards in it, and you don't have to specify a library.

"Hideaway N" means "When this permanent enters the battlefield, look at the top N cards of your library. Exile one of them face down and put the rest on the bottom of your library in a random order. The exiled card gains 'The player who controls the permanent that exiled this card may look at this card in the exile zone.'"

Any player who has controlled a permanent with a hideaway ability since a card was exiled with it may look at that card.

Hideaway now causes you to put the rest of the cards on the bottom of your library in a random order instead of any order.

Previously, permanents with hideaway entered the battlefield tapped. This ability has been removed from the definition of hideaway. Older cards have received errata to have an additional paragraph that reads "[This permanent] enters the battlefield tapped," and they now have hideaway 4.