Find a base which has most defenses close to the outer walls.
Destroy any 2 defenses sticking together using your lightning spells.
Create some space by destroying an outer building using some well placed archers
(Note:try to destroy the building close to the destroyed defenses so your archers don't die)
Deploy two giants to distract nearby defenses and send in your wall breakers
Then deploy the rest of your giants
Once all the defenses(especially the wizard tower and mortar)are focused on the giants create funnels of barbarians and archers near the defenses.