However, its second ability is also incredibly good. Whenever a nontoken creature you control dies, you put a 1/1 white Spirit creature token with flying onto the battlefield. The fact that these tokens have flying is incredibly good. Also, future copies of Abzan Ascendancy will make those flying Spirits bigger, and the triggers of the token creation will stack with each instance of the Ascendancy. This could easily be a four-of in Abzan decks if that clan's deck becomes competitive.
In any case, there will be plenty of Commander decks that will find a home for this card. Ghave, Guru of Spores decks will benefit a lot, as well as decks led by the new Khan, Anafenza, the Foremost. Even some builds of Karador, Ghost Chieftain and Teneb, the Harvester Reanimator decks will find a home for this card, as the value at 3 mana in Commander is extremely good.
All in all, this is definitely one of the better of the five Ascendancies.