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How effective would this be? Going against tau, marines and chaos primarily.

20 Fulgrite electro priests with tech priest dominus (with a psuedo generator and an autocadecus)
Allied grey knight librarian, lvl 3 with storm Bolter, and hammer.

The idea is to infiltrate as close as possible, charge something small and get the 3++ ASAP. The Libby provides some psychic defence and shenanigans, and packs the hammer for heavy lifting, the dominus provides a mess of shred attacks and iwnd for him and Libby, and the fullgrites ... Just a massive pile of attacks. (With hammerhand and invocation of machine might - they could get 60 attacks at str 9 instant death concussion.... That I'm guessing will wipe out pretty much anything they hit.) and once they that 3++ ... I'm guessing they will be a total pain to remove.

Or am I wrong?

It'll be a fun little Death Star, the main problem will just be getting across the table. But once you get there you will indeed wreck some face.

I'm at work and can't type much, but it is a strange idea.

Also note that Sevrin Loth can have the powers you might want from either Telepathy or Biomancy.