I forgot to mention other Aggro decks, such as Tempo Druid and Pirate Warrior.

As of 08/25/2020 I’d say Reno Priest is one of the best (and most popular) decks in Diamond 5 – Diamond 1 and Legend. Some other popular decks would be Handbuff Paladin, Aggro Kingsbane Rouge and Discard Warlock.