Allow your lanemate to. You don't need items to be effective. For instance your W and E don't even scale with anything. :P

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Still your teammates will need items more than you. A way you support is by letting others on your team get your CS. Don't double bomb if you're running low. ALWAYS save enough for ult. What items do you get first?
AP Twisted Fate | AD Carry Kog | Support Sona
Maybe try not double-bombing so much in lane. It really drains your mana FAST. Only double bomb to secure a kill in lane. Double-bomb in teamfights when you can afford it, but if you're running low save your mana for your support spells. With those items I think you should have enough mana.

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