Ezreal's Q does 140 damage + 110% of his attack damage, who knows how much attack damage the person had when they took this picture, the scaling might be terrible and the range isn't nearly as long as mystic shot.
You gotta be kidding, he looks the polar opposite of op from these abilities. His Q is a short cooldown skillshot that scales off his attack damage. His W is a tiny shield that gives his abilities a small slow. His E is an apparently very slow moving skillshot and the armor debuff only lasts four seconds. His ult is blitzcrank's rocket grab, but with a shorter range, a channel time, and a guaranteed hit but will place him in the middle of an enemy team most likely if used in a team fight. On top of that he has a huge character model, and that means he will be very easy to hit with skillshots.