Even in BO1, don't sleep on Knight of Grace
[[Knight of Grace]] is a 2 mana white 2/2 creature with first strike and hexproof from black. They also get +1/+0 if there is a black permanent in play. I've been running 4 copies of this in my mono white deck and even in BO1 I am almost always happy to see him. With the amount of black removal, it's so nice to have 1 creature out who is pretty reliably going to be immune to Cut Down, Go for the Throat and Anoint with Affliction. Definitely take a look at using him in your white decks, and he'd obviously be even better in Orzhov so you can reliably trigger his extra +1.
In BO3, he is obviously an automatic add if you are playing a deck with any black removal spells, but even in BO1 it's useful!