Scout for Clan Castle troops. Depending on the base, the troop you use for scouting will be different. If the Clan Castle is in the center, deploy 2 Balloons to the side closest to the castle. If the CC is on the out side or is lurable, drop an Archer to lure then out. Then proceed to defeat the clan troops with Archers and a few Minions.
Deploy your Balloons. Deploy them in a way that will allow them to reach the Air Defence the quickest. Don't just deploy them in a line around the base. Be sure to decide where the Teslas are, as a well placed Tesla will mess up the Balloons pathing and result in a 1 or 2 star instead of a 3 star. Drop a rage spell to speed up the Balloons progress, and heal your Balloons if they get close to a Wizard Tower.
Deploy your Minions and your King behind your Balloons once a few defences has been destroyed.
Watch your troops clean the base.
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This is a very powerful strategy that can three star max th7s. It does take much more planning and thought then a Dragon assault, but is cheaper and less unpredictable than Dragons are, as a balloons pathing is pretty straightforward.