I failed to get any candies at all yesterday, so couldn't do the free energy thing. I wasn't playing hardcore, but I never maxed out my energy either so I was using it as I got it. Was a mix of Light/Magic and Faimon, with the requisite 5 to summon the Dark flower or whatever it was.
Also, fighting in the arena is getting more annoying with everyone being level 40 and multiple 6*s, but I saw one I thought would be easy because it had a Wind Light Armor. Not only are two of my creatures fire, but light armor has always been a joke in arena for me. Nope, that guy fucking destroyed me. He hit my 24k light bearman for something like 80% of his health in one shot of his #3 ability (the one where if your defense is less than half of his, he ignores your armor). I'm sure he was decked out in 6* legendary defense runes to hit like that. I was shocked as fuck, because I normally leave armors for last because I never have to worry about them. So there are definitely ways to play this game with strange combinations.