The greatest champs globally to counter 永恒梦魇 include 复仇之矛, 祖安花火, and 探险家. These picks are all great at countering 永恒梦魇 with win rates over 55%. Even if these 永恒梦魇 counter picks are not taken in your lane, it's not a good idea to take him into any of these matchups. They will most often beat 永恒梦魇.
Yet, if the enemy team choses either 星籁歌姬 or 岩雀, 永恒梦魇 mains should seriously think about choosing him, as he easily destroys these champs with win rates over 56% against each ofthem.