Do you not have Corvus, venom, CMM, Medusa, Hyperion or cgr as 5 stars?
I have a duped Roblin at 6r2 and will be taking him up to 6r3 when I get the next Cosmic t5cc. He’s a lot of fun and does great damage. He’s not the most balanced champ, admittedly, but he’s pretty fun and a solid champ. Good mix of damage of utility, but lacking just enough of both to stop him from being a top champ. If you have resources to spare, I recommend taking him up just because he’s so fun to play.