The -5/-5 will remove the majority of creatures, even those with indestructible
Another cracking white card is Dawns Truce, the White Heroic Intervention
That's already a great baseline
Light-Paws, Emperor's Voice A good aura Light-Paws, Emperor's Voice is a two-mana White 2/2 that reads: "Whenever an Aura enters the battlefield under your control, if you cast it, you may search your library for an Aura card with mana value less than or equal to that Aura and with a different name than each Aura you control, put that card onto the battlefield attached to Light-Paws, Emperors Voice, then shuffle." This is undoubtedly going to be an almighty card in Commander but, given how potent the ability is, we wouldnt be surprised to see this at the forefront of an aggressive aura deck in other popular MTG formats too
Ao, the Dawn Sky gives you some resiliency to this by getting permanents when it dies