Instead of various different quests with different rewards, I would prefer the quests (and subsequent rewards) to be increasing. You beat the first one today, and then the next is slightly harder, so on and so forth. If you lost you go back to the beginning. Maybe every 5 you get a card beginning with something the bazaar costs 28 up to a weapon or upgraded even. Too many quests at once can become cumbersome, just slowly working it up to a level that is hard even for the top players might work better. The early days would be boring, but the later ones could lead to much deliberation over which deck is perfect for the situation.
Meh. Then again I am forced to wait patiently everyday for the Oracle, I don't know if I could stand doing a single bonus "quest" everyday. Especially if you lost one, to fall that far back could be horrid.