From my limited experience with AP (on Hard) I found that I had to be much more discerning about which items to buy. I also had to try harder to minimise losses, which can usually be done quite easily if you really want to. There is a new spell that is basically like Reaper's Time Back rage skill and I was using this a LOT. In fact it made the game pretty easy toward the end. I would just cast Mass Haste and buff my Horsemen, who would then charge right into the nest of enemies and take a load of damage. On Turn 2, I would wait something that wasn't too important, then cast the Time Back skill before the end of the turn.
