With this attack strategy you can 3 star any maxed TH7 with maxed teslas also.
Steps to follow :
1) Drop the giants in parallel to the wall
2) Immediately drop a line of wizards behind the giants inparallel
3) Now similarly drop lines of archers
4) Use one rage spell and drop the Wall Breakers
5) If a dragon or any other powerful troops come from the enemy's clan castle, drop all the minions to destroy it, archers and wizards will also be attackig them
6) Now drop your clan castle troops(I prefer giants) and the king
7) Use Heal spells to heal the units in the middle.
8) Once any air defense get destroyed, drop the Dragon on the other side of the AD to clean sweep the base
WHY THIS STRATEGY WORKS :
1) The Giants are uesd as the meat to take attacks from the various defenses and the "wizards and the archers are the actual attackers"
2) A single lvl4 wall breaker can break a pink or a purple wall when inside a rage spell, and wiz can cause very high damage when in rage spell
3) Now the king can directly go to the middle of the base, otherwise if the king is dropped in the beginning of the attack, he would simply be clearing the collectors and other building outside
4) And finally the dragons and minions can completely clean a base to get you a 100% (sometimes i don't drop the dragon)
THIS GiWiKi STRATEGY CAN EASILY 3 STAR A "MAXED" TH7
GiWiKi stands for Giant - Wizard - King, the order in which i drop them.
https://www.youtube.com/watch?v=9BfCj-Gg7UQ