What if Nether Grasp's suppression had a bit more "to do" for Malzahar to use it?
R: Nether Grasp
NEW Passive: While Nether Grasp is off cooldown, enemies damaged by Malzahar's other abilities gain a stack of Prophecy, up to a maximum of 5 stacks.
Active: Suppression duration changed from 2.5 seconds to 1.25 seconds + 0.25 seconds per stack of Prophecy on the target.
Reducing the up-front power of Nether Grasp in a way that interacts nicely with the many instances of repeated ability damage Malzahar has. Numbers may vary.
I don't know if he'd need any other changes with this, this was all I thought of.