You've no doubt heard about all sorts of formats getting on the Companion train, and Commander's Brew is not above it! In fact, we put together a deck using one of the Companions that seemed tougher to brew around - Lurrus.
This deck obviously has to be full of permanents of CMC 2 or less, which plays quite nicely into an aristocrats theme, led by Ayli, Eternal Pilgrim! And we've got plenty of ways of recurring Lurrus if they end up in the graveyard too. Since everything's so cost-effective, we can actually do a lot on each of our turns. Our takeaway is that in 20 years' worth of cards, there's enough even in a narrow restriction to make a great deck!