[Coldsaturn]

I went with Raf on my main account, and on the second f2p account I'm slowly building up as a diamond backup fodder, I went with Sylus.

Also, whatever card you'll try to pull or watch on youtube, make sure you have watched the related myth for that character, because boy oh boy they're going heavy with parallels and direct references.
The related myths are:

Zayne - Tower of Secrets
Xavier - Shooting Stars
Sylus - Beyond Cloudfall
Caleb - Lucid Dream
Rafayel - could be either GoT or Abysswalker or both