The greatest champions not in lane to counter Cassiopeia include Ezreal, Ashe, and Samira. These picks are all great at countering Cassiopeia with win rates over 63%. Even if these Cassiopeia counter picks are not played in the same position as you, it's not smart to take her into any of these matchups. They will very likely crush Cassiopeia.
Yet, if the opposing team brings either Ivern or Tryndamere, you should strongly think about selecting her, as she easily crushes these selections with win rates over 53% against each ofthem.
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