This "blue ezreal build" is basically a rehash of OLD OLD OLD Ezreal (covers all the things it had before minus scaling). Which was Brutalizer + Sheen (with like 35 armor penetration from runes). Search this thread for posts by me about blue ezreal builds though. It's already been almost going for 3 years. Spirit of the Elder Lizard is really what hits it off, by providing Ezreal quite a bit of damage + CDR + true damage (Ezreal used to carry just with red buff on him, haha)
The same issue exists now as it did 2+ years ago. It doesn't scale. Tristana on the enemy team? Lol, enjoy your lost end game. But it's so sufficient/efficient at dealing with tanks and having INSANE poke that.. yeah.
I should be happy really. Not only do I have proof that I invented the blue build before time began (kidding) but Ezreal's now being played/built in a way that has the same result as he used to be when I LOVED THE **** OUT OF HIM. Is it okay to play him in mid again yet though? That's all that's missing and maybe I'll become re-super-super-uber-omega-alpha-addicted to this game again.