Here is a clear Standard winner that will go right into every green Stompy deck without exception. All of Vivien's abilities look really good, and this planeswalker is clearly designed to push damage.
Her previous incarnation Vivien Reid from Core Set 2019 had a similar impact on the meta, which proved to be really efficient. That is why it is almost guaranteed that Vivien, Arkbow Ranger will stay at the current price level, or even go a bit higher to $15 threshold.
Unfortunately, Vivien's ultimate ability has no application in EDH formats, since there are no sideboards involved. But other than that, it's a very strong Standard planeswalker.