If you dont mind proxies or are playing on a free platform like Cockatrice, Id stick this in pretty much any artifact build
In variants of these decks utilizing Mox Diamond it gives the decks a way to utilize future Diamonds and also recoup the loss of the land pitched to an initial Diamond
For the purpose of finding a threat, I consider all Chromatics to be cantrips, but I only count Ancient Stirrings if my hand has at least one Chromatic
In this case the ursa isn't destroyed by Merieke getting untapped, because the delayed triggered event hasn't been created yet, since the activated ability, which is its source, has not resolved yet
Trove Warden Trove Warden is another white card that allows white decks to rebuild post-board wipe or build up some value to offset the inevitable Wrath of God
Compared to The Queen - Wicked and Vain, this is an upgrade, since you don't have to choose between drawing and questing