A friend of mine noticed that I was using Demon of Black Heaven as the leader of one of my teams, and asked me what the team was and what map I was playing it on. I tried to respond over the in-game message, but apparently Playmage has decided that I'm not allowed to send PMs anymore, so I couldn't send it. So, on the off-chance that my friend reads these forums, I decided to answer the question here, for whatever it's worth.
The team I'm using is Demon of Black Heaven (leader), Evil Imp, Enchanted Light Pinocchio (skilled), Earth Imp, and Flesh Lotus Queen. I am using this team to grind for Dark Pages in Dishonorable Knight - Difficult map. The Demon pumps attack and HP of demon types 2.5, so health is decent because everything else is a Demon type. But the Imps and Pino have such low attacks that I can use the team to grind without much risk of blowing through the level before I collect all 6 chests. The Evil Imp and Flesh Lotus Queen provide me poison to finish of the 5th and 6th waves relatively quickly after I get the chests, and the Demon's hit takes the majority of the 7th wave's health. For the friends' card, I always bring an auto-healer, particularly Chimera, if I can get one, so I can kill the last wave in about two or three spins.
When I was playing the Insane and Hell maps, back before the cost of revives made it imprudent to do so, I replaced the Evil Imp and the Flesh Lotus with my most powerful black and red cards that would still get DoBH's boost, but they're just not worth running, in my opinion.
I would just like to add that I really, really hate the "bring one of each color" stipulation that this round of bonus maps had. I much preferred the "don't bring this one specific color" or the "bring whatever you want, but this color won't be available" restrictions.