There are a lot of issues with this. You're taking up a lot of HQ slots for those Plasmancers, when Chronomancers are just better (and, I'd argue, Technomancers).
Killing 2x2 Cryptothralls is not difficult for most armies. A couple of decent plasma weapons remove them quite handily, for example. You're then giving up a bunch of Assassinate points since your opponent has likely taken that secondary in this scenario.
You're also going to need to get very close to get all those MWs to go off in the Fight phase, which means you get shot more effectively.
Ultimately there are better uses of your HQ slots and points than this little trick. It's fun, and might catch an unprepared opponent off guard, but ultimately it's not very good.
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