With the daily challenge system, players can earn XP for each type (except colorless), 5 XP grant a level up.
There are visible rewards for each type (Coin for Level 1, Sleeves Level 2, Deck Box Level 3), as well as other rewards for the total level.
I was able to determine that Level 3 grants a choice of 2 daily challenges each day instead of just one random one. Also, reaching Level 5 unlocks a second slot to store challenges so I don't have to complete one each day, but can wait a day. I found this post, explaining that the following rewards are currently being awarded:
- Level 3: Pick from 2 challenges each day
- Level 5: Store up to 2 challenges
- Level 8: Pick from 3 challenges each day
- Level 10: Store up to 3 challenges
Are these all rewards or is there more reason (except for the rewards for completing a challenge themselves) to level up past level 10?