This not only allows your deck to have access to additional colors but also helps get around the command tax since each of your commanders gets its own command tax, helping ensure you always have something to play from the command zone if you have nothing better to do
That could be Arcanis the Omnipotent to draw your deck or Merieke Ri Berit to destroy all your opponents creatures
Which is why I'm discussing this, too: What Should be Banned But Isn't
Likewise, it also works really well in counters decks (like my Hamza, Guardian of Arashin deck), as the cost to prevent your draw will increase as Esper Sentinel gets bigger and bigger, easily making it more costly to pay for than even Rhystic Study
Whenever a player attacks with five or more creatures, Aurelia, the Law Above deals 3 damage to each of your opponents and you gain 3 life
This is a bit tougher in other formats, especially in Azorius colors