Got the Earth quest today which is one of my favorites because I have a level 3 summoner in Lynn Natura and also a couple of legendaries like Kron and the Minotaur warlord.
The battles were all pretty high mana cap so I managed to use the big boys. Here is my favorite battle from today, a 46 mana cap one where I had the Minotaur Warlord, Prismatic Energy, Kron, Spirit Druid Grog all in the lineup.
How were the rewards? A Venari Crystal Smith, which is always welcome. The DEC rewards weren't much, though.