So how about we remake the Malz remake?
The current version is causing problems. I think everyone can agree on that point. To that end, allow me to pitch an alternative.
The idea is pretty simple. First, we revert the changes to every single one of his abilities, Passive included. Then? We swap his purple puddle of pain over to his Ult and rework his W into-
W - Void Rift: Malzahar opens a void rift inside his target, causing a Voidling to burst out of them dealing magic damage, stunning them for 1 second and slowing them by (percentage) for two seconds after the stun ends.
R - Null Zone: Malzarhar blankets an area with Void corruption for ten seconds, dealing (percentage) max HP damage per second to all enemy units in the zone. For every (amount) damage Null Zone deals, the radius of the effect doubles.
His lockdown becomes less oppressive while leaving him less vulnerable. Easier access to on-demand Voidlings helps him leverage his Passive. The new Ult fits with the theme of corrupting the area around him as a powerful zone-control Mage.