The top champions globally to counter Swain include Kalista, Xayah, and Sivir. These picks are all good at countering Swain with decent win rates over 59%. Even if these Swain counter picks are not played opposite your position, it's not smart to choose him into these matchups. They will usually destroy Swain.
Conversely, if the other team brings either Elise or Jarvan IV, you should strongly consider selecting him, as he easily destroys these champs with win rates over 56% against both ofthem.
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