Dancer is possibly the easiest range class to target since they have to go closer in order to attack. That being said, if you leave the dancer be for too long they'll eventually get your team with the amount of utility they provide. Shields, heals, attack and defensive buffs all add up if the team is able to live, especially the player that is partnered with the dancer themselves.

I only had one night to experience the Crystal ladder. I did see a dancer attempting to push themselves to top 10. I'm not exactly sure if they made it however.