there's no such thing/person (as): used to say that something or someone does not exist
I've told you before, sweetie, there's no such thing as ghosts!
I understand the meaning and the usage of it.
Does the expression "no such thing as" have any antonyms?
In other words, does such an expression exist to convey the idea that something might exist?
I googled it but got nothing.
I tried "is there anything as" and the top hits are something like
as adjective as ...
Searching for "such a thing" on google books gets about 185,000 hits while the Merriam-Webster dictionary doesn't include it, which probably means it is not established yet.