The Pro Tour is coming up in a few hours, so I'm going to power through the last of the brews I have now pretty rapid-fire. Starting with updated versions of some old standard decks.
https://www.mtggoldfish.com/deck/551364#online is my update to Aetherworks Marvel. Sultai are the colors I like here now. Noxious Gearhulk and World Breaker take the place of pretty good hits that are also castable. Aethertide Whale is a hit that lets you spin again. Renegade Map helps make Glint-Nest Crane much better (though its primary purpose is still to find the Marvel). And Ulamog is the biggest, best hit.
https://www.mtggoldfish.com/deck/548534#online is a very unfocused Bring to Light deck. It's certainly possible to get to 5 colors now. And there's quite a decent number of hits you can go for. But you want most of them to be fairly high in mana cost, but you need things to do early on.... well, I do think the Expertises help the deck, but I'm not hugely convinced this deck is quite where you need to be. But something to be aware of. Note that if this would help you Saheeli Combo, I could easily see that being very good, but a careful reading shows that BtL can't grab Planeswalkers, and only getting Guardian just isn't enough.
https://www.mtggoldfish.com/deck/548550#online is a look at a green ramp deck. Splashing colorless is pretty cheap, and Rishkar's Expertise is a Big Game. Possibly even more important is that Emrakul as the de facto big top end doesn't invalidate you nearly as much as it used to. Lots of mana plus lots of ways to use it makes the deck overall look pretty good, but you do have to be wary of highly synergystic decks (most notably combo decks), so probably those would need to fall out of favor, or you need to up your interaction a little, for it to be good. If it's just Copycat, then probably upping your Walking Ballista count can get you there.
https://www.mtggoldfish.com/deck/547510#online is an update to the deck I'd been calling "Jolly Green Giants". Woodland Wanderer feels so much better now that it doesn't have to face down Reflector Mage. And Rishkar's Expertise is pretty good in a deck looking to make 6/6s and 8/8s (though you don't want to cast the Wanderer off of it). Also, lots of the deck works with Winding Constrictor (man, that card is just fantastic). Quite possibly there should be a mix of more Anguished Unmaking in the main deck; the card seems pretty well positioned right now, with not so many super fast, powerful aggro decks.
https://www.mtggoldfish.com/deck/551391#online is the update of my RB control deck. The biggest gains it gets are from the removal of Copter and Emrakul, which squeezed it out either side. But Shock and Fatal Push help a bit, and Yahenni's Expertise is real. Probably not busted enough to be best, but just a solid collection of good cards can't be too bad.
Last but not least, Metalwork Colossus: https://www.mtggoldfish.com/deck/547677#online
Trophy Mage helps us a little bit here, as does Scrap Trawler. But the main improvements are, of course, the Improvise Cards. Spire of Industry shows up as well, and Walking Ballista being fetchable in this deck is pretty nice - I only have one copy main, but between Inventor's Fair, Sanctum of Ugin, and Glint-Nest Crane, you have pretty good chance to find it. Also the Crane is exceptional in this deck - there are approximately a bajillion (I think it's 29?) artifacts. And it can crew Aethersphere Harvester to keep you alive - possibly there should be more of those (swapping a Caravan for one seems good for a lot of metagames).