I do have Expedition Map in the list but I might give Wayfarer more thought.
I have always meant to get some testing in for Boreas Charger. I think it maybe could be a good card but in a lot of my more control based white decks I seem to have issues where I too often have more lands than my opponents for some reason. I would probably justify Land Tax over it which for now I have opted to pass on.
Smokestack might be a thing. I have always been hesitant to run it though because of that full turn where it doesn't do anything though. I tend to prefer Tangle Wire in decks that quickly tempo to play rather than decks that plan to play late game control.