I have been playing Dalaran Heist adventure and I am certainly sure that it needs balance changes. The main problem is treasure and anomaly.
The biggest problem is always stay in extreme possibilities: the runs are too easy or you get smashed pretty fast sometime. It is hard to stay in the middle thoughout until the last boss. Essentially, the goal of this adventure should be: work with sinergy cards and treasures (and anomaly effect) to beat the bosses.
As we all can observe when playing the adventure, if you don’t get good options for treasure powers, you will often lose. The fact of existing “good” and “bad” treasures is the main reason for this. We would not need to restart the game over again to get something acceptable. This exceed the “challenging” factor. My suggestion for this is: balance “bad” trasures, like “Dr. Boom’s Remote”, “Mysterious Tome”, “Resourcefulness” and “Small Backpacks”. In other hand, there are treasure too good, like “Robes of Gaudiness”, that makes the run very easy. One way or another, balance treasures can bring more challenging runs.
Anomaly is just the same way. For example, some anomaly effects grants big advantages for Kirin Tor Citadel final bosses, like cast spells twice. I think it would be better if the effects change every battle instead of every run. Also, some effects needs to be balanced/reworked: “Arcane”, “Wild Magic” and “Growing”.