Jax is currently an incredibly strong, overpowered champion due to recent buffs, dominating all phases from early lane to late-game carry; consider banning him or picking strong counters.
Leverage his Q mobility, E stun, and R's defensive stats for safe trades and high survivability, dealing unexpected mixed AD/AP damage.
If facing a Jax, prioritize champions like Garen, Gragas, Malphite, or K'Sante, and exploit his relatively high early mana consumption to gain an advantage.
Stats
Q
W
E
R