Ultra Rapid Fire Mode. It was introduced to League of Legends back in 2014 on April Fools day. Sometimes Riot graces us with this game mode "just for fun" and for the 2020 World Championship, it is back in the client. Fans get to experience the 80% reduced cooldown and constant mana flow once more. But which champions are the best when it comes to URF? We decided to take a deep dive and look for the five most annoying and most fun to play champions, so you can truly get the best out of this limited game mode.