The top champions not in lane to counter Cassiopeia include Ezreal, Ashe, and Samira. These are all good at countering Cassiopeia with decent win rates over 63%. Even if these Cassiopeia counter picks are not used in your lane, it's not a good idea to take her into these matchups. They will usually beat Cassiopeia.
Yet, if the opposing team brings either Ivern or Tryndamere, you should strongly consider selecting her, as she easily destroys these champions with win rates over 53% against each ofthem.
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