The greatest picks outside of lane to counter Ornn include Kai'Sa, Ezreal, and Tristana. These champs are all great at countering Ornn with win rates over 55%. Even if these Ornn counter picks are not taken in your lane, it's not smart to choose him into one of these matchups. They will most often beat Ornn.
Conversely, if the opposing team choses either Lillia or Swain, Ornn mains should strongly consider taking him, as he easily crushes these champions with win rates over 54% against each ofthem.
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