Mana-got Support
I got this idea from someone's blue Urgot
build.
Start
Coin
+refillable
-->
Coin for money and regen to help you survive.
Early Game
tear
(and sightstone
)-->
Tear to start stacking, sightstone isn't necessary if you you want to be called a troll or don't want to spend money like me.
First Full Item
frozen fist
-->
This is a nice item because it makes you tankier, gives MORE MANA, and adds more cc to your kit when you AA.
Second Item
manamune
-->
Lets you stack faster and is your first AD item.
Third Item
ROA
or frozen heart
-->
I haven't tried ROA but it could work. Frozen heart gives more tankiness, mana, and helps reduce the enemy team's damage in conjunction with your passive.
Fourth Item
new tear
--> archangels
-->
About now your first tear item should be done stacking, so it is now time to build another tear. Finish it when you feel it to a good time.
Fifth Item
Frozen heart
, more mana items
, or more tank
.
Frozen heart if you didn't get it, or maybe you already filled this slot with an MR item. Sadly NONE or the MR items grant mana.
Sixth Item
Get boots as necessary (I prefer swifties
).
Full Build

Pregame
Run exhaust
, like a real support, and flash
.
I run 12/18/0 with the Lethality perk and thunderlords. AD Runes.
I'm not trolling right?
:3
, although I'm kinda meh on the 6th item and games rarely actually lasted that long. Might be worth leaving the slot open for control wards. Lethality runes/masteries with thunderlords along the lines of what you proposed.