I started playing this game with 1 turn sundial (I think it was bugged since they lasted two turns), and to be honest not much has changed for me. I started, as with most, with 0 upgraded cards, and I find the nerf to Sundials fine. Decks have already been posted to counter this nerf, and in my opinion, they are working fine.
Plus, with alchemy cards released, the metagame is changing right now.