2x Shadow Dragons was my very first team in this game due to lucky key drops. At the time, I use to run it with Wight and Brian the lucky for I didn’t have an Alchemist. A decent build for it now would be:
Wolf Knight (with all traits, work towards it)
Wolf Knight’s ability AND skull damage does true damage, allowing it clean up everything that Shadow Dragon misses. Wolf Knight also has the lowest mana cost of any true damage ability in the game at 8 mana.
(EDIT: Oops, didn’t see PS4/Xbox. Ignore the traits thing. xD The above build is still applicable, but not as strong.)