Welcome to the blind random EDH deck picker!
This generates a random deck for each player, and doesn't tell them what's in it or how to play it.
Click "new game", then send the URL to your friends. Each player should click the deck name to copy their decklist to their clipboard, and then paste it into cockatrice.
It's up to you how you want to divide up the decks. Each player picks. Loser picks. Everyone chooses a player number before the randomization. Whatever you like!