IMPORTANT NOTES:
This build is intended for ARAM when playing against 3-5 AP champions and NO enemy marksmen. Large amounts of Physical damage will mess with this build, and sustained physical damage blows it up instantly.

What advantage does it have then? While you have less health than the adverage bruiser or tank, you'll be regening a huge amount of effective health. At start, you will have 2/3s of a pot running constantly. At late game, you'll have over 100health regen per 5 seconds. In mid and late game, if you live through a combat you'll be near full health by the time the next one starts (assuming average ult cooldown is 90seconds). Every time you leave a fight without dying, you are starving the enemy of gold.

Some things to note. At game start, If you find you are full health the majority of the time, buy more health on your next back. Regen is worthless if you are full health most of the time, so better to buy stats you need. If, on the otherhand, you find yourself slipping out of fights with 100 HP and constantly below full, then buy the items that maximize regen, like Guardian's Horn and Spirit visage.

TLDR:Build is for anti-AP ARAM games only.