The top picks out of lane to counter 럼블 include 케이틀린, 아펠리오스, and 트리스타나. These are all great at countering 럼블 with high win rates over 59%. Even if these 럼블 counter picks are not used in the same position as you, it's not smart to play him into one of these matchups. They will likely win against 럼블.
Conversely, if the enemy team brings either 하이머딩거 or 하이머딩거, 럼블 mains should seriously consider selecting him, as he easily dominates these champions with win rates over 53% against each ofthem.