The greatest champions not in lane to counter 잭스 include 칼리스타, 카이사, and 제리. These champions are all great at countering 잭스 with high win rates over 55%. Even if these 잭스 counter picks are not taken in the same position as you, it's not a good idea to play him into any of these matchups. They will very likely destroy 잭스.
Yet, if the other team picks either 릴리아 or 티모, you should strongly consider choosing him, as he easily wins against these champions with win rates over 54% against each ofthem.
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