Hey,
I've been playing for a while now and there is something I noticed about the daily quests:
Most of them are doable fairly well with a basic deck. Collect gold chests, do PvP, win a campaign, play a campaign with others. They are all doing pretty well.
The one that stands out is "Do 2 rPvE Maps on difficulty 6 or higher". If you don't have the best cards yet, you loose on difficulty 6 more often than not. This can lead to several hours of playtime for this one quest. The jump from rPvE diffculty 5 to 6 is enormous. Maybe set the quest to "difficulty 5 or higher?". This way, it's still a challenge, but becomes doable for new players.