AD/Hybrid midlane Soraka
It's good vs Yasuo. Take E first and use that to poke his shield off, then kite him backwards if he ever tries to engage on you.
Start 
since you do use a bunch of mana early, then get a 
into some 
as your core items. Next, you can go for like 
if you need more ap to save your dying teammates, 
for more dmg, 
are good on you too. 
for tanks, mayb a 
for a last defensive item.