The playtest sessions on Magic: the Gathering Arena really help in checking the metagame in Standard, Pioneer, and other formats. The actual deck gameplay testing is very much different than just being familiar with the Top decks built such as Esper Midrange, Grixis, and Mono-Black Midrange. The point is that their unfamiliar cards are being used and you would get caught off-guard in the process. Also witnessing how certain cards interact would help you solve once you face a similar scenario in the future.
It is a good thing that my teammate and deck master Oliver has been doing these test matches on ranked and one of his recent deck features is the Domain Control deck with The Kami War mythic saga from Kamigawa: Neon Dynasty.
I asked him to record his matches and here below is the first match of the deck he played on MTG Arena. He was facing Esper Midrange. Check out the video below. Other Standard matches on MTG Arena were also uploaded on my Youtube Channel so please do check those out.