This is a huge boon to any deck thats using disturb, as theres a big old crossover with Spirits there
Cid, Timeless Artificer Cid, Timeless Artificer is an interesting build-around that I imagine comes in two flavors: You either go hard on looting, cycling, and self-mill to throw multiple copies of Cid in the graveyard, or you do some Mirror Box shenanigans
Mulan Free Spirit is your choice against big character decks, Alice Accidentally Adrift for item decks, and Cinderella Gentle and Kind as more of an all-rounder
Normally during these expected value articles, I provide a reminder that you shouldn't let the expected value be your only decision point when it comes to figuring out whether or not you should buy a box, but in the case of Ultimate Masters specifically, the expected value is extremely important thanks to the increased MSRP of the box and because the reprints from the set are going to give players a chance to buy some really powerful Modern (and also Commander) staples at a huge discount
The Starter Commander decks generally cost less than the price to put together the singles, so they're a good deal
Having to choose between a fight effect at instant speed and a conditional Negate is good for playing different matchups
