It's 10th August and I'm finishing off the daily quest I started last night, but never got around to completing. It's earth splinter and I'm finding that the Unicorn Mustang at these levels is serving me well. So well, in fact, that my win streak has taken me well into silver III league!
Two reward chests, this time, containing a legendary potion and my second Baby Unicorn. DEC stood at 56.143, so I bought a Goblin Mech at the market. Now I'm at 17.519 DEC. Fingers crossed it helps my game at this level, at least in matches where I have the mana for it.
I'm outta my league!
11th August and I'm no longer enjoying being in silver III league! The daily quest was water splinter and it was loss, after loss, after loss. The points loss each time was so minimal, however, that it didn't even take me back down into the bronze leagues where I might have stood a chance. It's as if the game were tormenting me! It took me a couple of hours, but I got there in the end, with 4 bona fide wins because I was only granted one surrender. The reward chests both had cards in them, perhaps to make up for the torment.
DEC sat at 27.35 upon completion and the next daily quest is death splinter. As for the Goblin Mech, most of the battles were low mana and when I got 99 mana it was with the little league ruleset! So I didn't get much chance to use the card.
12th August and I managed to finish the daily quest started yesterday evening. Death splinter isn't a bad selection, with the dark astronomer being quite strong for a 4 mana card. It went better today than when I started last night, though. Perhaps because I wasn't as tired? Two legendary potions in the chests. 35.062 DEC.
The next quest was water splinter. Not the worst teams I have and the last win of the quest put me in silver II. The good thing is I got 3 reward chests, the slightly disappointing thing is they all contained alchemy potions, when I could do with cards, and the bad thing is that I'm probably going to spend the next 50 games getting my butt kicked.
Finishing the day on 44.182 DEC.
13th August winnings:
14th August was death splinter. Winnings was a nice amount of DEC with the potions. 114.737 DEC. Time for a visit to the market!
I bought a Wood Nymph to help with the front monster's health in battle. I thought I would be getting a Divine Healer, but the price had gone up since I last looked at her. Never mind, I'll get there little by little. I'm up to 10 of my own cards and it's nice to see them building up. If I count the two duplicates I'm actually up to 12.
15th August and my last daily quest for this season is complete. Rewards were all DEC. Interestingly, as the season draws to a close, my toughest opponents seem to have been pushed up into the next leagues, making wins a bit easier.
Today, 
My stats according to PeakMonsters:
I did a few more games to just tip me over into silver I and up the rewards for the season's end, while I still can. It netted me a few more DEC as well. Currently standing at 114.657, with a new season starting in a few hours.