Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Blue Ezreal History
I've been playing since S1 but in S3, I played the most. I've become quite fond of Ezreal and played him a lot. In S4, I tried to bring back blue Ezreal but it didn't work that well. Now in S6, they buffed some items and changed the game into adc meta, which makes blue Ezreal viable again.
Poke a lot, ult to snipe, make the other team sad in /all chat. Blue Ez is the kiting god and basically no one can catch you without heropowers.