(And if youre an idiot like me, who doesnt read the piece of paper with READ THIS FIRST before thinking you know better and shuffling the cards, theyre also numbered so you can put them back in the correct order.) Once youve played that through once, you can go ahead and shuffle as much as you want, and then play the game proper
Atraxa, Grand Unifier may have a 7-mana, four color cost, but with Flying, Vigilance, Deathtouch, and Lifelink, and the ability to reveal the top ten cards of your library and add a card per card-type into your hand, this is a serious bomb
Then if you exiled a land you make a 3/1 Dinosaur token and if a nonland you'll make a Treasure to help cast them
For example, Meren of Clan Nel Toth looks at your graveyard on your end step and finds your favorite reanimation target or gives you a gravedigger effect