Not Updated For Current Season
This Build Will Own Any Champion, Anytime, Anywhere. If you are facing a team with stuns and slows, I would suggest getting Mercury Treads, No matter what champion you are playing. If played smart, you can easily 1v2, and you are a great asset to your team. You should always come out positive with this build, and in most cases be the team carry.
I don't depend too much on Ezreal's Ult, I mainly use it when initiating a teamfight. Using his Ult at the start of a teamfight is a Great way to hit most enemy champions as well as give your team an advantage by taking a little chunk of their health.
I use Mystic shot mainly to harass/annoy the enemy champs. Because of it's Short cooldown you can really do a decent amount of damage to someone from a good distance. This skill gets stronger when you acquire more attack power, and also applies on-hit effects. Which is why Phage/Trinity force works so great for this skill.
I Max out arcane shift first mainly to use as an escape spell. Also, When attacking someone, it does great amount of damage to an enemy champion while throwing them off a little.
Essence Flux is just used as a support spell in this build, only used to increase ally attack speed.