I believe the Urg version is better than the Uwb version. My reasoning is u get to play a real sideboard and firespout is so good to right now. It improves the matchups that are bad for the deck and doesn't hinder the matchups that are good all that much. I also think that skybreaker is better than the creatures.

Now I have some questions. How good is piller? Is it better than chalice? And the last question is how good is back to basics in the meta right now. Where I play there are a bunch of merfolk and some goblins, which it isnt good against. But there is some threshold and 42 land decks which it is. But even the threshing decks play like 5 basics because of waste and b2b and bloodmoon.