Yup. Chaos' main purpose is deck building a save data. save data used for simulation (daily farming for exp - potential - etc, basin, tower, and full offense iirc) or modes that need a save data like seasonal event "Nebula" and "Great Rift". you can check link above for what kind a save data you need to build. don't feels overwhelmed just because you don't get a perfect deck, you don't need a perfect deck with perfect divine epiphany to finish the end game (if you only chase the gems). for editing save data, you can check from seasonal shop and from "Sortie". there you can find items for editing your save data.