Aatrox Malphite Kayle Zilean and Sivir in the undying legion
because sometimes, killing someone twice just doesn't cut it.

All suggested builds are examples. the end product will vary depending on game and playstyle comfort. additionally, the rolls could be shifted depending on bad matchups or counters.
based on the assumption that aatrox is building
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malphite is building ap/tank


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kayle is building on hit ap

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zilean is keeping sivir safe and mobile
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and sivir is ready to boost aatrox and malphite into battle and back them up with
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just text from here out:
during a teamfight, the goal is to engage with malphite, follow up with aatrox and buff them with the three squishies. a lot of output is going to come from aatrox, Kayle and sivir combined with their high attack speeds, while malphite and zil have the job of locking down and peeling off whoever needs correction with what cc they have. additionally, everyone should have GA on their list of things they want to build, to add salt to the wound.
Aatrox has the main goal of diving the back line and cutting everyone to pieces, it is more than likely he will die on his first dive, but hopefully he's skilled enough to fill his bloodwell or get off a good ult so that he gets the most out of rageblade, gunblade and his passive. malphite's job is to soak up as much cc as he can and slow down the enemy team, taking tenacity boots to keep him as a constant threat though initially, he's the one who really starts the team fights. kayle should save her ult for as long as she can in teamfights, as this could mean the difference between the last man standing dying or the last man standing to happily shred everyone on their way to victory. zil has the important job of keeping kayle or sivir on the move to take advantage of their wave clear and damage but durring fights he should be focusing on aatrox, kayle and sivir and noting which one will go down first and using his ult on whoever they focus in a priority of: sivir, kayle then aatrox. additionally, his cc is key to keeping everything under control. Sivir is the one who gets everyone to follow up the teamfight boosting aatrox into the fight and letting her and kayle skirt around the edge of the fight and kite those who dive past what cc there is.
keep in mind that this team is weak to assasins and relies on being able to brawl it out with the enemy team.
hopefully this inspires some fun games.