After the release of the movie Thor: Ragnarok, I keep seeing a fan theory on the Internet saying that Mjolnir might return in Avengers: Infinity War.
The logic: Thor took the Mjolnir to Doctor Strange's sanctum and kept it there. Doctor Strange replaced it with a fake Mjolnir which responded to Thor's summon in the end. So, Hela ended up destroying fake Mjolnir and real Mjolnir survived. Doctor Strange did it on the request of Odin, so that Thor could realize that he is God of Thunder, not God of Hammers.
While this is a beautiful theory and it's possible for Doctor Strange to trap the Mjolnir in a pocket dimension or maze of portals, I am curious to know whether he could really create a replica of Mjolnir. Here, Mjolnir doesn't need to be strong, but it should respond to Thor's summon and be able to do thundering and immovability stuffs upto some extent.
Has Doctor Strange shown such set of powers in comics?