[ChicletPrime]

This is ... thank you. This is so much work and I so appreciate it.

A couple of small questions while I absorb / think about this:
Xavier and Rafayel scale on ATK (per what you said before)
Zayne scales on DEF
What do Sylus and Caleb scale on?

What I'm aiming for:
So, if Xavier scales on ATK, what I really want is to match stellacrum, with 5* where possible or 4* if not, using only cards that also have ATK as their Talent. Protocores should also prioritize ATK but with substats as noted (Crit Rate or Damage (for clearing trash), Oath Recovery, Dmg to Weakened, etc), and should hopefully be SSR/gold ranked so they can be pushed as far as possible, assuming their stats are a good match.

If I do not have ATK cards in this scenario, I should still go for ATK protocores, but with a substat for the card Talent?

If I cannot match stellacrum, then Crit Damage is a better stat?

Yes?

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I link the really important hard information stuff (to me!) on the main page, if that helps.

EDIT: you hit 250+ posts! your title has changed - joo so beautiful, dah-ling.