When Vice Chancellor Bonaparte tells Aster that the fate of the Slifer Red dorm hangs in the balance of their Duel, Aster insults him by claiming that he would have to become his sponsor before they can utilize his Dueling, but that he wouldn't be able to afford it with his salary
His business was limited by unreliable suppliers
The interface has also been cleaned up a bit, giving players better control over setting up the particular phase to speed up play, or to backtrack and see which card the opponent played that caused a particularly nasty occurrence during a specific turn
this turn, neither player can target "Amazoness" monsters you currently control with monster effects, also they cannot be destroyed by card effects
Generally, in Commander, you have three opponents who have all sorts of targeted removal just waiting to be thrown out to any player who gets the tiniest bit of an advantage in the game