The Great Aurora — ruling 1

If a player is required to draw more cards than their library contains, that player loses the game. If all players lose the game this way, the game is a draw.

The Great Aurora — ruling 2

As The Great Aurora resolves, first you choose any number of land cards in your hand to put onto the battlefield, and then each other player in turn order does the same. The lands enter the battlefield simultaneously.

The Great Aurora — ruling 3

The number of cards you draw is equal to the number of permanents on the battlefield that you shuffle into your library plus the number of cards from your hand that you shuffle into your library.

The Great Aurora — ruling 4

A token is owned by the player under whose control it entered the battlefield. Tokens shuffled into a library count toward the number of cards drawn, though they cease to exist upon becoming part of a library. Regardless of what you’re using to represent tokens, you won’t shuffle that physical object into your library.

The Great Aurora : règles, fonctionnement et interactions (MTG)

The Great Aurora is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Each player shuffles all cards from their hand and all permanents they own into their library, then draws that many cards. Each player may put any number of land cards from their hand onto the battlefield. Exile The Great Aurora.

How it works : The Great Aurora

Original English text — Wizards of the Coast / Scryfall

#1June 22, 2015· Wizards of the Coast
If a player is required to draw more cards than their library contains, that player loses the game. If all players lose the game this way, the game is a draw.
No other card is named in this ruling.
#2June 22, 2015· Wizards of the Coast
As The Great Aurora resolves, first you choose any number of land cards in your hand to put onto the battlefield, and then each other player in turn order does the same. The lands enter the battlefield simultaneously.
No other card is named in this ruling.
#3June 22, 2015· Wizards of the Coast
The number of cards you draw is equal to the number of permanents on the battlefield that you shuffle into your library plus the number of cards from your hand that you shuffle into your library.
No other card is named in this ruling.
#4June 22, 2015· Wizards of the Coast
A token is owned by the player under whose control it entered the battlefield. Tokens shuffled into a library count toward the number of cards drawn, though they cease to exist upon becoming part of a library. Regardless of what you’re using to represent tokens, you won’t shuffle that physical object into your library.
No other card is named in this ruling.