HEARTSTEEL EZREAL + ZED
This comp is good to play when you have a Heartsteel on stage 2-1. It caps extremely high since it allows you to play Heartsteel in stage 4 and potentially stage 5 to win the game. Purposedly lose on stages 2 and 3. On stage 4-2, raise to level 8 and roll for the above board. If you get Heartsteel Ezreal, you can play a 5th Heartsteel. If you get Bigshot Ezreal, you can play a 4 Bigshot. If you get CD zed, you can play a 4th Crowd Diver, etc. You can push to 9, then you can play 3 Jazz if you hit Lucian. If you're on the verge of losing, you can eventually want to pivot out of Heartsteel: Illaoi for Sett/Zac, Qiyana for Yone.
For items: Ezreal: Blue Buff, Red Buff, Infinity Edge (but can be any AD items really) Zed: Edge Of Night + Omnivamp items Sett/Zac: Tank items
What makes this comp strong? It is because you can have 2 carries due to Heartsteel cashouts.