Urborg can make your swampwalk creatures unblockable, and it can make your colorless utility lands tap for mana
Evaluating the relationship between complexity and flavor is a constant balancing act
Art: Art is subjective, and I know there are people that love Yu-Gi-Oh!s art
To have two commanders, both must have the partner ability as the game begins
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
These are Nicol Bolas, Arcades Sabboth, Chromium Rhuell, Vaevictis Asmadi and Palladia-Mors