To scry, players privately look at the specified number of cards from the top of their library, put any number of them onto the bottom, then return the rest to the top in any order
I have every confidence you'll all do so well
Those days look to be behind us with Day of Judgement returning to Standard, providing a hugely important piece to control decks, allowing a reset of the game that can often be a three, four, or five-for-one (or more!)
Here's how the myth-vs-fact breakdown plays out for anyone still deciding
People love it because you never know which cards you'll open, and it compresses the whole Magic experience of getting cards, building decks, and playing games into one sitting
Sometimes the card is an instant hit, but others take more time to shine, like Lion's Eye Diamond