This army is for the TH8 trying to push to Champions League. Although slow and tedious, it'll get you to Champion League where your level 5 Barch can't. It is capable of 1-starring many TH10 if used correctly.
Your Balloons will be helping out by taking out Archer Towers and maybe Teslas so that your Minions and BK can clean up for the 50%. The Lightning Spell is used to destroy CC troops or destroy a building for 50% (or both) and your Rages will help speed up your Balloons to take out Archer Towers that are well deep into the first layer, or ATs under guard by ADs.
Minimum Troop Housing Space Required: 200Minimum Spell Housing Space Required: (not specified)
Bring a CC with a PEKKA or any troop capable of destroying many buildings at once for the 50%. BK is helpful too, for 50%.
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Try to find a base with its Air Defenses mostly in the core or simply out of reach of the outside of the base, and 50% of buildings outside. If one or two are outside the core that's no problem. You might want to find a base where the AQ is in the core, so she won't interfere with your Balloons. If you can try to find a base with as many Archer Towers in the core as possible to make your Minions have an easier job.
Deploy 4-5 Balloons per outside Archer Tower/Tesla that is not protected by Air Defenses. If the Archer Tower is not protected by any anti-air defenses 2 Balloons will suffice. If you barely fail to destroy an Archer Tower use another two Balloons; their death splash should finish the AT off. Try to leave one side untouched if you encounter Teslas because you won't have enough Balloons to take out all the ATs; take out the Teslas instead.
If you lured out the CC with your Balloons group them up together and take them out with your Lightning Spell. Prioritize Witches and Wizards over Archers when zapping.
To take out Archer Towers that are protected by an Air Defense drop a Rage Spell and drop 4-5 Balloons. They should one-shot the AT.
Lure out any remaining CC troops from the Lightning Spell blast with a single Minion then deploy a few spread out Minions to group them, then you can use the Balloon's death splash.
Your remaining Minions should be out of range of any anti-air defenses; deploy them in a spread-out fashion to take out outside buildings.
If any Archer Towers/Teslas remain use your CC and BK to take out that side.
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If done correctly you should get the 50% and be a few more trophies closer to Champions League.