[Unique Suggestion] Mage Spirit Crystal Sword

I've always found elemental conversions a very cool, under appreciated concept for spell casters that the dev team was always extremely hesitant at exploring due to the abuse with items like Eternity Shroud and Gloomfang.

The main idea for this is to be a strong enough base caster weapon acquired from Uber Cortex or very rarely from the Feared Maven Invitation. Then, its uniqueness comes from allowing massive build diversity by being able to change the element of every spell in the game and being able to scale them in new ways.

I've avoided using the affix "x% of spell damage is converted to [fire/cold/lightning] per [red/green/blue] socketed gem" as the intention fo this item is not to abuse conversions but to simply change the elements of spells, overwriting even built-in conversions of skill gems.

The Synthesized mods are of course locked in, with the "+x to all spell skill gems" being heavily weighted. A +2 would be around the same rarity as a 3-passives Voices if not rarer.

Of course, this is a reference to the Spirit Runeword from D2.

I'd love to hear what you think about this! I think some really cool builds could come from it as well as some interesting utility options to go along (ex. for lightning spell builds, using Vaal Flameblast with shock scaling gems with this to achieve maximum shock value on a cooldown)