Here are some most effective Clan War strategies for all Town Hall levels in Clash of Clans. Please take a look. You can find loads of videos about them on Clash of Clans Land or Youtube.
- Town Hall 6: GiBarch, GiLoBarch.
- Town Hall 7: Mass Dragons, Mass Hog Riders.
- Town Hall 8: Golems + Hogs; Dragons + ZapQuake; GoWiVa.
Another awesome place to learn Clash of Clans strategy is https://www.youtube.com/user/ClashNerd/videos
Enjoy my friends!