Unit cards: Centaur archer, Mermaid, Witch, Fire succubus, Dragon rider and Black knight.
Skill cards: Comet shoot, Rain of arrows, Phoenix strike, Healing wave, Hercule's strength and Athena protection.
This is a great card set for defeating the cave of trial 5 because the units can easily keep knocking the super goblin back and destroy the castle with it still alive. The Athena protection card protects from any hits that the goblin can make and the Comet shoot helps heaps with the Bomber revenge waves. (This setup costs 3000 mana and it helps to have all units lv 5)
lol Chilibrot that goblin in cave 5 isn't a bug and it does take damage (just takes heaps) and it is meant to one hit KO everything or the last cave is the easiest by far. If your having trouble, finish the game with every character until you get the special attack card Athena's protection which makes you invulnerable and hit the goblin with EVERY unit you can get. (Don't use special attacks that will hit the goblin before your ready to kill it or you'll be doomed to lose)
 "Epic War 3"){kind=icon}
 "Lethal War Zone"){kind=icon}
 "Warzone tower defense"){kind=icon}