Need help with Corrupting fever maintain with Power siphon..

So, im playing Spellslingdr Exsangvinate Scion , using Power siphon 4link. With life tap. But SADLY it eats only like 30 mana for attack and corrupting fever buff maintain requires 200 life used!!! So, i can only maintain it via attacking every freaking step, its very annoying... Any ideas how to make it cost at least like 100 mana?! Support are hard to change, Maim is essential (115 mana multy) and lifetap is 200, third gem is already 165% multy.
Im so tired...i like build, but this thing...annoying as hell. I just want to use buff and run through map without worries T___T thats such a bummer...
If somebody have time and want to check - its my one character on league, VompireWithASnack in profile... And im already tight with gem slots, so i doubt its possible to add something special...But anyway I would appreciate any ideas...

up :(

There are some nodes near Witch that increases mana costs of skill. Also, Fevered Mind is a corruption outcome of any Cobalt Jewel, which will further increase your mana cost depending on where you allocate it.

What I am actually puzzled about is - why do you need to do such a thing? I mean, Corrupting Fever has a 6 seconds duration There is no reason for you to grant yourself a refresh"on hit" - just make sure you spend 200 Mana (life) in 6 seconds and you are good to go. 30 cost seems to be good enough even with low atkSpd - and if you really need to enter the battlefield with Corrupted Fever on, just attack around until you get the buff, and then into the fray

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Maxtrux wrote:

There are some nodes near Witch that increases mana costs of skill. Also, Fevered Mind is a corruption outcome of any Cobalt Jewel, which will further increase your mana cost depending on where you allocate it.

What I am actually puzzled about is - why do you need to do such a thing? I mean, Corrupting Fever has a 6 seconds duration There is no reason for you to grant yourself a refresh"on hit" - just make sure you spend 200 Mana (life) in 6 seconds and you are good to go. 30 cost seems to be good enough even with low atkSpd - and if you really need to enter the battlefield with Corrupted Fever on, just attack around until you get the buff, and then into the fray

It sounds better than it is ;( Like, for example I cast Fever - when i will attack something its already 5 seconds, then, after killing one pack with 1 cast - Im running to next pack, and timer is going while im running, then oneshot next pack... Like, there is never enough packs on ur every step.
Like, alright, my attack time is like 0,6 seconds, 30 manacost = need something like 7 attacks for sustaining. Which means I will be JUST attacking almost 4,5 seconds. which leaves us with 1,5 seconds to move in IDEAL world, where we do not fuck up and etc. Guess, how good is map clear, where you have time to move only 25% of ur time? Its bad. Yes, maybe attacks will be faster, but its still forcing you to attack more then you need, much more. =/
Damn, Fevered mind was a good idea, sadly just checked - it was nerfed from 50% to shit,where you need to grab 5 Notables just to have same effect...:X sadface.

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No longer increases the Mana cost of skills by 50%. No longer grants 30-40% increased Spell Damage. Now causes Notable Passive Skills in radius to be transformed to instead grant 10% increased Mana cost of skills and 20% increased Spell Damage.

Well, I guess maybe I just need another build without such gimmicks :(