User blog comment:YourPrivateNightmare/The mystery of Blue Ezreal/@comment-5556439-20130613220418

Its a "deterrent build" much like attacking a Rammus with 42 Thornmails.

Blue ez focuses on staying out of range of any and all bruisers due to high CDR on E/Q allowing you to kite indefinetly from any would be killer. The sustained % damage from BotRK and high DPS from Marumana/Iceborn allows you to hurt anyone you want while staying far away, and thats before you factor in LW. Its a really nice build that works if your team has the right amount of durability. BotRK gives a second chance in case your E is on CD and if the enemy is on top of you or if your extremely low, ultimately giving you the chance to CONTINUE kiting. CDR boots + furor enhancement = god mode.

I personally choose to go :

Last Whisper, Marumana, Iceborn, CDR/Furor Boots, Infinity Edge, BotRK

A good Ezreal is a fucking pain on his own but a good ezreal using Blue build???? In Dunkeys voice: NOT EVEN CLOSE BBY <3