By saying “do it 5 times”, I mean 5 difference room in one Level. Coincidentally, I also have to do it 5 times, by using daily Delve Scrolls, to actually beat Faction team at Level 200!
I never even consider using Horned Asp, as I don’t think its damage will be strong enough, untill I read how @TheIdleOne do it. As he said, it’s great to cast him when you don’t want to mess with the board, or when Chief Dargon is buffed enough to one-shot everything. That small damage instead of repeatly casting to hope to skulls to align, can add up a lot to make winning easier.
I got Lava Crack / Slither Pit / Dragon Hatchery in the middle. Scale Guard’s double spell damage and Bone Naga’s Infernal Armor are quite deadly, so I lost my 1st Chief Dargon there.