So this is a TH5 variation of my TH4 Mass Barbarians and the Lone Healer strategy, still as unstoppable as ever with the third Army Camp and the lack of Giant Bombs to stop the Barbarians. Of course, you will need the Healer donated by your clanmates, if you don't then this strategy won't work. NOTE: YOU WILL NEED A LEVEL 2 CLAN CASTLE, IT WILL NOT WORK WITH A LEVEL 1 CLAN CASTLE.
Your Barbarians are gonna do all the work, your Archers are just there for dealing with any Clan Castle troops. The Lightning Spell is not necessary but if you can bring one to assist in dealing with Clan Castle troops. You will probably need Wall Breakers from this point on because Barbarians are not the most effective troop to deal with Walls. This army is meant to deal with TH5 and solely TH5, TH4s are overkill and TH6 just won't work with the second Mortar and Wizard Tower (and the fact that many have their Air Defenses centralized)
Minimum Troop Housing Space Required: 130 Minimum Spell Housing Space Required: (not specified)
Obviously request the Clan Castle Healer, at least level 3, preferably maxed out. Request one high-level Barbarian/Archer to go with your Healer, because the extra troop sure helps.
Before the attack: Try to find a TH5 with an exposed Air Defense (there are still many at this level). You generally want to find a base like that because Air Defenses at this level can destroy your Healer before the Barbarians can destroy the Air Defense.
Lure CC with Barbarians, you should need no more than two. If there are no Clan Castle troops skip to step 3.
Draw the CC troops out to a corner of the base with more Barbarians or one Archer if that corner is out of reach of any Defenses. Then use your Archers or the Lightning Spell (if you have one) to take them out.
Use a couple of Barbarians to check for bombs and spring traps near the Air Defense; the Spring Traps are your worst enemy in this attack, while Bombs can be annoying.
Once you have checked for traps deploy your Barbarians with two fingers in a moderately tight group, tight enough such that the Healer when deployed will heal all of them at once (this requires a bit of practice).
As the Air Defense is destroyed deploy your Healer, don't worry about Air Traps because two Air Bombs aren't going to do a thing to your Healer.
Deploy Wall Breakers to get your Barbarians into the enemy base, be sure to time your deployment well such that a Mortar will not wipe out your Wall Breakers.
Once that's done correctly your Barbarians will have free rein to the rest of the base. You generally shouldn't fret about the Wizard Tower because damage is all outhealed by the Healer. Neither should you fret about the point defenses; usually it takes three point defenses shooting at one Barbarian to take down the Barbarian.
(No execution notes)
Enjoy a great 3-star victory. Because the army trains rather fast (excluding the Lightning Spell that is optional) you can use it as a farming army, provided you have the steady supply of level 4 Healers to pull it off.