In the game "Hearthstone", what is the best rank possible?

The best rank possible in the game Hearthstone is Rank 1 Legend. This is because reaching Rank 1 Legend means that a player has surpassed all other players in terms of skill and performance, and they are the top-ranked player at that particular moment. It is considered the ultimate achievement in the game, showcasing the player's expertise, dedication, and competitive prowess.