I'm looking to get those 250 gems for reaching the crystal league without using too much elixir, any suggestions?
A nice, cheap, tactic is to max your army camps with archers or fill half your army camp with barbarians and the other half with archers. I'll give you 3 reasons why it's effective. 1. Archers and barbarians are super cheap troops and they train very quickly. 2. They're super good for getting Town Halls that are located outside of the base. 3. It's very easy for these troops to get 50% on even a very hard base by taking out the exterior buildings.