A Humble Malzahar Fix @Riot
Make his passive a fusion of the old passive and new. Annie style, 4th spell casts and pops 1.5 second spellshield. Keep his mana costs on the high side to make it a meaningful decision. You either have to pop it to get IN by using QWE or STAY in by using R as the 4th. Put a cool down on the effect if need be, after it pops a 20 second CD before it builds again.
You'd force support Malz to waste mana or be risky.