Hello everyone,
I am a support main and play everything as supp like MF. MF is pretty strong and fun as supp. You just need to go ap and ward pretty well. Usually I think full AP supports are useless but MF supp isn't. MF can't ks you bcs of her damage overtime E and can slow enemy's pretty well with her E. MF supp is basicly all about the E. It is your damage, Poke / goldincome & your slow / counter ability.

Passive
Your passive is pretty usefull to poke and push early game but late game it won't do high damage but is still pretty usefull

Q
You Q is better then you probably think. It has a AP scaling and you can still do damage with it (not as much when you goes ad)

W
Your first point is the most important one because then you have the mobility that you need. Bcs of the passive of your W and the movement speed from Ludensyou don't have to build boots. This is a huge advantage bcs now you have a ''extra'' slot.
Anyways your W is pretty useless as mf support and I recomand you to only use it when you are pushing a turret or doing drake or something like that..

E
Your E is your most important ability! It has a nice slow and does pretty much damage, this is why your build is based on your E. To improve the damage of your E you have to get a Liandry's against tanks and in general a Ludensfor the extra poke for your supp item. Rylais Is also one of your core bcs of the huge ap it gives and the slow for your E.
You can use your E to poke, to escape and to counter an attack like thresh his Q

R
You R has a high ap ratio and works pretty well with Liandry's and Rylais. You can use it as random poke or to secure a kill under the enemy tower. With ap scaling it is also pretty usefull to use it to steal Dragon or Barron. You got extra poke from Ludens and Liandry's

In progress...

In progress...