Mage/Dark Wizard Help Anyone have an (ok) mage-riftwalker build utilizing fatal?

Been playing for a while now and tried all the archetypes in mage however I really like riftwalker however I cannot figure out a good set to get a lower spell cost. Any recommendations I would be thankful for even if they do not fit the ideals :D

 

https://hppeng-wynn.github.io/build...Y0I270e031f1g000010036C0z0z0+0+0+0+0-j-RwsdT1
WynnBuilder build:
> Cumulonimbus
> Conduit of Spirit
> Ringlets
> Slayer
> Cold Wave
> Diamond Static Ring
> Lachesism
> Contrast
> Fatal [t6t6t6]

Spam meteor-snake as fast as you can, but make sure to always stay above 100 mana. Manastorm sustain goes hard.

 

https://hppeng-wynn.github.io/build...Y0O270m001f1g000010036C0z0z0+0+0+0+0-j-RwsdT1
WynnBuilder build:
> Logistics
> Conduit of Spirit
> Dark Shroud
> Slayer
> Lodestone
> Cold Wave
> Lachesism
> Contrast
> Fatal [t6t6t6]

 

Ty for both of these but ima try and build something myself, i get rlly annoyed by negative health regen however these will probably be very helpful in future. Ty <3