With this kalista variations i got free emerald, and im climbing to get diamond.
Kalista / Fiora
Fiora variation.
Its pretty easy to build, You can rush ad/bruiser items on Nilah, Guinsoo on Ashe, tank items on Mordekaiser. On level six you roll these champs on 2 level, to get strong board with eldritch, to safelty level up to 8/9 and swap comp.
If You have eldritch emblem, you can swap fiora to briar, keep tank items on mordekaiser, and make 7 eldritch comp.
Kalista / Karma
Karma Variation
If you are getting a lot of ap items, you can choose second carry Karma. Bluebuff is core item, but instead of redbuff you can make Morello, and instead of rabbadon you can give her Jeweled Gauntlet
Kalista / Gwen
Gwen Variation
If you roll gwen fastly, and You dont have Sugarcraft emblem, you can play gwen in this Kalista composition.
Tips
In all of these compositions, you search for strong board on 6 level, to safely reach 8 level, where you roll for Kalista rakan 2 star, or Gwen, Karma, Nasus. If u have core items, and strong board, you can level up to add more preservers, or strong champions, like diana or morgana.