A Rivalry of Wizards

What is the collective noun for a group of wizards?  A “wrath” of wizards?  An “argument”?  I’ve been gathering together some of my favourite wizards.

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First, of course will always be Gandalf.  I grew up on The Lord of The Rings and of all the characters, Gandalf is the most compelling.  He has become my benchmark of what a wizard should be.  Here is my favourite image of him, from that famous poster by Jimmy Cauty : More