“Now, yer mum an' dad were as good a witch an' wizard as I ever knew.”
(Harry Potter and the Sorcerer's Stone)
What’s the meaning of the highlighted part?
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Harry's mum was a good witch and his dad was a good wizard.
Yer mum and dad were a good witch an’ wizard.
How good were they? They were as good as any witch or wizard I ever knew.
Yer mum and dad were as good a witch an’ wizard as I ever knew.
These constructions are maybe, possibly, just a little bit too colloquial for, say, an exceptionally dry academic journal; but anywhere else they’re fine.
They have used superlative degree.
We use superlative degree when we compare more than two persons or things with one another.
It means that (Harry's) Mom and Dad were the best witch and wizard the person had ever know.