Read more If you want to read up on the topic as a introduction, you can read this (older) but interesting article by wizards them self can be found here
You get cheap burn spells, powerful white removal, and a bunch of combat tricks to keep the damage flowing
SIGNED + ALTERED Some artists, in addition to signing, add small drawings or alterations
Theres no priority pass in between repetitions by the way - you reveal one card for the first opponent in turn rotation, they decide on exile or hand, after which you reveal the next card for opponent two and so on, until all opponents have chosen
Why not do that with each opponent
While very minor, there are also some differences in the short instruction manual packed with each of the preconstructed deck sets