Hmm, I'm a beginner at this, but I"d like to suggest a slight modification to the 'Light' deck, which is the element that I chose (I'm beginning to feel like it's one of the weaker elements >.<). I had noticed that with the suggested 17 light pillars, I was okay pretty much 100% of the time when I battled at the 2nd level, but when it had passed that stress-test I moved it on up to Lvl 3 and was rather constantly running dry or running low on Light. I gradually added light pillars and now (at 19 pillars), I get a pretty consistant 6 pillars in my first hand (sometimes one or two more, sometimes one or two less), which means that I can usually get a dragon out on my third turn (rather crucial on Lvl 3, I've found). Now, it works about 75-80% of the time on Lvl 3 (or at least enough to make it profitable...especially when you count in the spin's bonuses and the extra chance to get a card compared to Lvl 2).
So anyways, just a suggestion. ^^ I just thought I'd give you some feedback on your decks. Other than that, it's worked out great! It's been a good, relatively cheap way to grind Lvl 3, which is just what I needed.