i have only one atttack speed mark and i found it work a lot better then 9x attackdamage cuz i'm lacking attackspeed at the beginning so this fixes my prob and it actually increases my farm by a lot. My experience with rushing Last Whisper is great cuz it gives you damage + penetration, so its 2 in 1, i've personaly tested a lot of games going Last Whisper and it just works better then rushing Trinity Force at the beginning and take Trinity Force 2nd, i found Essence Reaver not that great because its kinda a waste of money for me, it gives you damage and mana regen but its just not good enough, and if you go by my build (runes) there shouldnt be a lot of problems running out of mana. I'll put benshie and mercurial as defensive items, thank a lot for response.

PS: Also i've wrote if you are running out of mana take Essence Reaver in the game plan.

You should ditch the Attack Speed Marks and should replace them with AD Marks helping to secure last hits for instance under your turret more easily. Furthermore, rushing Last Whisper isn't an ideal option. Compared to items like Trinity Force, Blade of the Ruined King or Infinity Edge it won't increase your damage by a certain amount. It's more a third or fourth item purchase supporting the damage purchases beforehand and helping to shred armor. Rushing Trinity Force is a great on Ezreal, Blade of the Ruined King works great on him aswell, Essence Reaver could be an option and Banshee's Veil and the new buffed Mercurial Scimitar are worth to mention as defensive items. All in all your guide lacks of coding and structure what makes it difficult to follow trough.