Follow the following steps: Register an account on the wiki
I'll cover what sideboarding is, why you should do it in your games, what makes good sideboard cards, some of the common things you'll want to be prepared for with your sideboard, answer some common questions, and give you a few tips and tricks that I wish I had known sooner
The rest of the deck also has ways to get a Lore bonus once banished or add some defense to your heroes, and the amount of tactical options at your disposal keeps the challenge-focused gameplay from getting repetitive
Another strategy that mono-white loves to employ is life gain, and Voice of the Blessed is all about life gain
It might not be quite as good as the land-type-centric fetches like Scalding Tarn, but Fabled Passage has a huge advantage over other generic fetches thanks to its ability to have the lands enter untapped
Merida is thinly traded