Mana Pot
well as a support main like myself l often have to distract the enemy from farming by poking and healing my add therefore lots of mana were consumed. Like wise champion like
doesn't use mana so it is a HUGE advantage for them early game and champions like
will suffer as they depend heavily on mana. Having to recall every 3 mins for mana will cause them to lose their farms and as support their adc will not sustain long.
so i can build the 
through masteries.
main and the best item for mana regen is tailsman of light

as it give you mana and visions