I may be old-fashioned, but I always thought it was "coven".
A nonsense of psychics?
The art of medicine consists in amusing the patient while nature cures the disease. Voltaire
A drivel of psychics.
"What gets us into trouble isn't what we don't know, but what we know for sure that just ain't so!" - Mark Twain
What's the collective noun for a group of skeptics?
A skip of skeptics?
Search for knowledge and understanding.
An ohchristnotthisagain of skeptics?
Or, for short, a Hebrews 13:8 ?
The style as we like is the humdrum.
A quibble of Skeptics
For those of a Scandy bent:
A smorgasbord of skeptics.
After all, we are so tasty!
You cannae kid a kidder kiddo!