To have two commanders, both must have the partner ability as the game begins
When it is Sarahs turn, she must attack with that Siege Rhino and it can only attack Chris or Felix
Get one into your graveyard somehow (Prying Eyes below would work), and then use one on the other, get three free copies of it, then use them on other instants or sorcery cards in a graveyard for a grand total of, unless my math is awful, fourteen spell triggers
Art: Art is subjective, and I know there are people that love Yu-Gi-Oh!s art
Suddenly, your pingers and low-damage spells are that much more effective
It provides a good amount of Celebration boosters, typically with a bunch of rares to uncover, along with the handy storage box