For the one complain about revenge waves, and complain that its unfair, let me tell you that you have skill cards and you can regen your unit which enemy couldnt do that.
nice :D, beat cave 5 before all others thanks to this thread: here are the must haves to beat Cave 5.Spells:Athena, Phoenix, Hercules, Comet and Healing spell. Troops: Centaurs, Succubus, Mermaids, Witches, goblins and the black knight keep this commnet alive by copy pasting it but since I had Grullborg Grimtooth I had enough mana to replace goblins and black knights by frost giant and dragon rider + i had the lightning bolt card extra it worked out just fine^^
 "Epic War 3"){kind=icon}
 "Infectonator : World Dominator"){kind=icon}