If you're looking for a full complete guide that tells you why does this build have this and that. Then you have come to the wrong place. This is a good build I like to run on ezreal. I choose these items because I believe they give you the most damage output, so you can carry your team. Also I have only one item for defense (GA), this is because you are playing the ad carry. You shouldn't go head first into team fights, you should be doing damage from a far.