Shift Malzahar's Passive To His Ultimate

The biggest problem pre-rework Malzahar had was not taking too much damage, as late game he could have up to three AP+HP items built STANDARDLY (RoA, Liandry's Torment, and Rylai's) it was that he was too easily knocked out of his ultimate by crowd control effects.

So why not solve the problem by shifting the cc immunity to Malzahar's ult as a strictly active effect.

"ACTIVE: Malzahar Grounded icon knocks down an enemy champion. For the next 2.5 seconds Malzahar channels, during which the target is Suppression icon suppressed.

A Null Zone is opened beneath the target that lasts 5 seconds, dealing magic damage every second to both Nether Grasp's target as well as all other enemies within it.

(Addendum) In addition, Malzahar blocks the first instance of crowd control, lasting for 1.0 seconds."

Remove passive and add something that actually benefits him instead of giving him this once-toxic-but-now-useless pseudo-tank/banshee's veil passive. As for what that new passive should be, I honestly have no clue, as his kit would be pretty well-rounded and fair after the implementation of my proposed change, and the last thing I need is another repeat of the last five months.