Scry was introduced in Fifth Dawn and became the first keyword from an expansion to then be included in a core set when it was included in Magic 2011.

701.17. Scry

• 701.17a To "scry N" means to look at the top N cards of your library, put any number of them on the bottom of your library in any order, and put the rest on top of your library in any order.

Translation

• 701.17a. Scry is an ability, it uses the stack as normal, and is done all at once so no player may respond to a certain part of the scrying.

Reminder Text

To scry N, look at the top N cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.

Other Notes

• When you scry, you may put all the cards you look at back on top of your library, you may put all of those cards on the bottom of your library, or you may put some of those cards on top and the rest of them on the bottom.
• You choose how to order those cards no matter where you put them.
• You perform the actions stated on a card in sequence. For some spells and abilities, that means you'll scry last. For others, that means you'll scry, then you'll perform other actions.