Mage/Dark Wizard Sharing true-riftwalker lv105 build, want suggestions

(can't share links yet because im new, put "#9_0cD0Pf0x707W0t80K00x40OH07f0n0f170f171f000010036C0z0z0+0+0+0+0-1Tl-RxspT1" after builer/)
> Morph-Stardust
> Libra
> Aleph Null
> Capricorn
> Yang
> Intensity
> Succession
> Diamond Fusion Necklace
> Cascade [t6t6t6]

I know pure rw is completely useless, but i sort of dislike the other archetypes and i still wanted to at least try playing raids. Is the build any good? Most builds i found seem to have less meteor damage and mr but better spell cost. Also, my build might be insanely roll-dependant and overpriced, no idea though

Im not really sure if 66 mr and 24.5k meteor damage can outweight the terrible spell cost in the build (for example, relative to full morph, this is +4 meteor and +4 ice snake, with morph already being terrible). Yes i know that spell cost is much more important than mr, which is why im doubting the build i made

I imagine i could fix it by trading mr for cost or max mana, but so far i couldnt find any items that would do that while fitting in the build

 

here's the tip for building riftwalker: get manastorm ability (check the tree in riftwalker builds in guide if u want, gaia in particular) and then get your mana costs as low as possible to abuse it