If we preferred black instead, we might consider a Tezzeret the Schemer style of deck (obviously still using Karn), as Tezzeret is great for ramping into Karns Temporal Sundering and synergizes well with a lot of the same cards we might be interested in because of Karn
In a Two-Headed Giant game, Providence causes the teams life total to become 26, but only you actually gain or lose life
Id say no if we hadnt seen the arrival of Sheoldred and Bowmasters
Here's how you could use it
Bennie Bracks, Zoologist is a great way for token decks to see at least an extra card each turn with a minimal mana investment, thanks to convoke often making this close to, if not entirely free
So if I am playing a mono blue deck, I dont have the best conventional removal available to me but I do have countermagic available to me