Today I was completing the Earth Quest which is very different now that Obsidian has been made available for battling. The +1 magic damage makes a big difference with some of the magic damage creatures available for selection.
Unfortunately, I am not able to promote to Silver III yet as the opponents are still a bit too tough. The opposition is still able to beat me even though they don't have much better cards.
I think the difference is that many have already mapped out how to best use the new cards that have been released. There were times when I wanted to use a card or two from earlier releases only to find that I don't have a copy anymore. Totally messes up the strategy.
Rewards-wise, I got a Gargoya Lion which is I guess better than getting credits, potions or some small amount of DEC. Looking forward to better rewards in the days to come.