Alright, so there have been a lot of changes since the previous raid events and really this warrants a new look.
First, I would like to say that Mobage finally noticed that their rewards had gotten just stupid and they upped the value of them. Woot.
Second, about the decks. The layouts I recommended previously are still more ideal because they will function on the same math, what has changed is the way attack power works in this event and its relation to AP as well as the way boss rewards are distributed.
AP: One AP is equal to 100 ATK PWR while Six AP is equal to 400 ATK PWR. This means that players probably won't be able to attack every boss once regularly since they will have to be using a minimum of 100AP each time. This change is...understandable, but unfortunate. In attempting to minimize players abilities to one hit farm bosses, they pretty much made it impossible for low/mid levels to accomplish anything.
Regardless, it should be obvious that you ideally want to be against bosses with insanely high health so you can dish out Six AP attacks since they have the best value.
BOSS REWARDS: So, no more critical bonuses. Players earn Maze Flowers (the exchangeable items) based on the damage they do to the boss and MVP. Players earn Sylvan Berries (the point reward) for defeating the boss, discovering the boss, and getting the last hit on the boss.
What this means for players is they won't be able to gather exchangeable items unless they can do mammoth damage to the bosses. Essentially, if you don't have raider cards, don't expect to be able to gain HP through Maze Flower turn ins.
OVERALL: I'm still broke from HW so I won't be participating much in this event. This event is purely tailored toward benefiting high level players who are willing to spend heavy amounts of HP. Between the AP set up preventing players from hitting bosses once and the necessity to do huge damage to a boss in order to gain Maze Flowers...this event is made to make you spend.
On a bright side, awful lot of nice cards in those maze flower packs, I imagine we will see those cards drop nicely in price near the last few days of the event.