With infestors losing their winfested terrans and now only normally OP, the replaced spell by the dev team is the microbial shroud - but why bother getting this spell?
It requires Hive, which of course is available whenever players begin the infestor spam, yet its cost of 150/150 is rather steep for a spell with 9 range cast. While it does last for 11s, most units will see this spell and just kite back.
The cast range is only 3.5 - this is definitely no BW dark swarm, as units are not only still hit, a hydra clump of 3.5 units is only 9-10 hydras when trying to create a concave, as hydras aren’t going to be useful in a clumped ball vs psistorm or potential tank shots.
This only benefits against attacking void rays and carriers, both of which are better dealt with using fungal for VRs and neural on carriers, assuming no detection while burrowed. A liberator will lose half of its dps, yet the range is so far with its upgrade, it is better to stay sieged. Battlecruisers again can just be neuraled and dealt with there - yes 25 mana more for neural but guaranteed to have the chance to kill the BC rather than it float away.
Devs, please just remove microbial shroud, time should be better spent on either looking into the fungal/neural upgrade, or perhaps overhaul the viper’s blinding cloud as ZvT is more likely to fight mech, or something with utility beyond memes.