You will need to update your OS to at least Mojave, but World of Warcraft is a very popular game, and has been great when it comes to Mac support.
WoW is a MMORPG, and just recently had its 18 year anniversary.
The new expansion for WoW will be launching in a few days, and the pre-patch for that expansion dropped support for High Sierra. Mojave works, but you get a messaging saying that your OS is out of date, and you should upgrade soon, and they recommend Catalina (I think), but Mojave works fine.
Blizzard probably will not drop Mojave support for WoW for a few years.