My strategy is to start of buying 3 swordwrathes to defend the miners, next 5 more miners, set 4 of them to mine and 1 to pray. The rest is pretty simple, just keep buying speartons, and adding miners when needed. Sometimes a little bit of backup is required, so having a size2 giant at the back is helpful. In battle once, chaos spirit giants were coming at me relentlessly, but when about 30 or so speartons attack a giant at once, it clears up real quick with very little damage. The only thing that has destroyed them all so far for me was 5 size2 giants.
Sorry ifsomeone has already posted this strategy, I assure you I didn't mean to copy.
username:ApocalypseRay code:374