The greatest picks globally to counter Ivern include Aphelios, Kalista, and Zeri. These are all good at countering Ivern with win rates over 62%. Even if these Ivern counter picks are not chosen in your lane, it's not a good idea to choose him into any of these matchups. They will most often destroy Ivern.
Yet, if the other team brings either Rumble or Ziggs, you should strongly consider selecting him, as he easily destroys these selections with win rates over 55% against each ofthem.