Infinite variety needed in world construction? (3,5)

I believe the answer is:

all sorts

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'infinite variety' is the definition.
'all-sorts' can be an answer for 'variety' (all-sorts means a variety of things). I am not certain of the 'infinite' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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