Okay so i'm a Gold 3 ranked player and have played approximately 60 games with Cassiopeia. Not a lot I realize, but I just wanted to make this guide to help players who want to give her a shot, and will be updating it as I get in more games with her. She is very scary, with a lot of team fight potential, though the big thing you have to realize is that she is not a god mode Champion. she is ALL SKILL. Her ult is going to be missed a lot in your first few games an you will struggle landing Q's and W's with her which negates a lot of your damage via you're spam E. all i can say is practice, and focus on farm. land Q's and W's on champions as often as you can to help speed along your passive and propel you into the mid/late-game where Cass shines. her Ult is fantastic in team fights and kiting. one of my great Pentakills with her was me kiting the entire enemy team in jungle and landed my ult on all of them and was able to W,Q,and E them all to death. by the time they all came unstunned two were dead (their ADC, and Assassin Jungle) while the others were left at mid to low health (except their Braum support, go figure) as they turned tail and ran. all that was left was to chase them down. which since they rest has little to no escape abilities, didn't take long with the rest of my team cutting them off.