Instead of [3222222] try [3132334]. The essential talents would be Mage Armor at 4, Force of Magic at 7, Reabsorption at 13, Arcane Brilliance at 20.
The main concepts here are to:
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Put Force of Magic procs in Medivh’s control. By taking reabsorption you can now deliberately put yourself in a bad position or under towers to soak up damage for a proc because you get a large heal out of it every time.
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Maximize Medivh’s EHP over time. The armor from Force of Magic lets him take more aggressive positioning, like a Cassia, without needing to rely on W which gets blown early in this build for Force of Magic procs. Reabsorption, plus spellpower bonus from Force of Magic, provide superior sustain. These combined make Medivh tough enough to just “stand and fight” instead of needing to pick out targets like a Genji, which is the ideal situation for juicing a 60% sustained damage bonus.
Then, Arcane Brilliance at 20 simply because this build just uses up more mana in practice. Stable portal, though a nice synergy, isn’t really essential to the build but leyline + temporal flux is real mana heavy in a build that’s already tight on mana.