This one is probably very controversial, but remember the juggernaut rework? That thing is a nightmare to most people, but that how I managed to climb to gold after being stuck in silver. While everyone was discussing whether Mordekaiser or Darius was more broken, having those two permabanned. Skarner was kinda left under the radar for a short time. I realised that he was beyond busted and just spammed in ranked games and won almost every game. Didn't work for too long when his winrate suddenly got to 60% and people were freaking out.