The best picks outside of lane to counter Swain include Samira, Zeri, and Lucian. These are all great at countering Swain with win rates over 55%. Even if these Swain counter picks are not taken opposite your position, it's not a good idea to choose him into one of these matchups. They will most often crush Swain.
Conversely, if the opposing team choses either Karthus or Kog'Maw, you should strongly think about taking him, as he easily dominates these selections with win rates over 53% against both ofthem.
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