This item can be found inside Gift of the Nightborne after defeating Gul'dan in the Nighthold on Normal, Heroic, or Mythic modes. It also has a chance to be listed on the Black Market Auction House.
Here you can buy Living Infernal for EU or US Servers.
You'll get guide for getting Living Infernal
You'll be able to get Living Infernal
Additional budget for Character transfer or Character boost to max level. BMAH Services in Shadowlands now requirement to have a max level character on server, so Trial character will not work.
Free time on evening, if you choose selfplay option