In my previous question about psychics, it was pointed out that Stephen Strange was name-dropped in Winter Soldier as one of the people Hydra was keeping an eye on as possible threats.
Obviously, in most of his Marvel comics appearances, Dr. Strange is a sorcerer and his powers draw directly from magical entities. However, this seems like a pretty radical departure from the overall tone of the MCU thus far, where even the seemingly-magical powers of the Asgardians are explained as "sufficiently advanced technology" (things like Loki's scepter and the Tesseract).
Has there even been a Marvel comics version of Dr. Strange where his power was not truly "magic", but explained as something else? I'm just curious if there is any canon for the MCU to draw on to avoid having to introduce magic into their world.