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A 1980 ad for a series that might have been, but ended up never happening. Immediately after, Roger McKenzie left as writer on DAREDEVIL, and Miller was fully occupied as both writer and artist on the series. So Marshall Rogers took over DOCTOR STRANGE with issue 48, the issue Miller's run would have begun.
Roger Stern says that Miller initially bowed out to do a James Bond story, that also never materialized.
The ad ran in issues cover-dated Jan 1981. https://viewcomiconline.com/marvel-spotlight-1979-issue-10/
Here is a black and white magazine ad for DAREDEVIL 168, Jan 1981, the first Miller issue where he was both writer and artist:
https://viewcomiconline.com/howard-the-duck-1979-issue-8/ (page 57) . The ad ran 2 months prior to DD 168.

To see what Miller could have brought to a DOCTOR STRANGE run, just look at AMAZING SPIDER-MAN ANNUAL 14 (1980) and 15 (1981)
https://viewcomiconline.com/amazing-spider-man-v1-annual-014/