with this build you will get almost 5000 health and over 700 AP, dont look at official stats, cuz items stack and cuz of his passive too.

Well... its simple, most of items that i recomend stack over time, so later it gets, more powerfull singed is, and singed was made for long games. Many times people say, that you shouldnt stack mana on singed, but his passive is converting his mana into health, bigger mana pool you have, bigger HP bar you get! Just try it, you wont regret it. =D