Even without these new toys, Sagas is a popular theme to build around, with no commander being more popular than Middle-earth's Tom BombadilTom Bombadil
Already the list includes some incredibly powerful cards, such as the powerful and expensive Doubling Season, which was just included in the prohibitively expensive Commander Masters set
Blue Suns Twilight Whats yours is mine Taking control of an opponents creature is always a fun thing to do, but it can often be a little too expensive to be worth it
Its a little slower given it comes in tapped, but when you do get to untap with it, youre going to have a bunch of extra colored mana to play with which is what makes Nykthos, Shrine to Nyx so good in the first place
If white is only a splash color, I would also expect the land selection to be mostly or entirely blue ideally you can get all your white mana from two-color lands like Hallowed Fountain, so you dont need to play any white-mana-only sources that cant cast the majority of your spells
Take out key cards using Surgical Extraction and Extirpate and go for the kill when they dont have much of a library left
