I repeat, FOR WHATEVER GODDAMN REASON, DO NOT TOUCH LADDER!
I was at Challenger 1 with my mostly Level 9 deck for about a month. I'm Level 10. I know, F2P sucks. I never touched ladder. Then, recently, a gold rush event was held. So I was tempted by the gold that I can get and thought that I could hold in Challenger 1 until I get all the gold. I was SO WRONG.
I lost 150 trophies, thanks to me fighting Level 11, Level 12, and Level 13 noobs with their proudly overleveled cards. I had to fucking play for 1 and a half hour to get back to Challenger 1. It was such a torture to my brain.
Finally, FOR WHATEVER GODDAMN REASON, DO. NOT. TOUCH. LADDER. EVER.