The main unbalanced character, most often sent to the ban, is in the second chapter of the compensation
https://ensiplay.com/. Usually, Io is very often prohibited by The International, but now Eathshaker, Dawnbraker, Tiny and Beastmaster are very strong. You should choose a hero that no one wants to play against. Everything is on the site, you just need to get acquainted with the game.