The primary reason for that is because it makes all multicolored spells cost two less (even opponents)
They are: Ajani, Caller of the Pride, Zetalpa, Primal Dawn, Terror of Mount Velus, Gratuitous Violence, Boros Charm, Drogskol Reaver, and Fireshrieker
She can exile enchantments or tapped artifacts or creatures, which is solid
With all that said, it's a good enough effect to run twice, even if the second version does remove your commander, so also consider Rolling EarthquakeRolling Earthquake
Airbending Airbending is another new keyword action that helps players control the board without aggression
You can use Yuna, Hope of Spira, to reanimate them for free with a finality counter, or Rydia, Summoner of Mist to reanimate them by paying their mana cost