A new concept art from the Avengers: Endgame - The Art of the Movie reveals Dr. Strange sent Thanos on a magical mystery tour like the Ancient One did to him in Dr. Strange film. The concept art comes from Marvel Studios visual development head Ryan Meinerding which was he posted on Instagram. Check out the concept art below.
View this post on Instagram
The concept art writes,"Unused moment from Infinity War where Dr. Strange tries to send Thanos on a magical mystery tour just like the Ancient One did to him. #drstrange #thanos #infinitywar."
Meinerding didn't exactly reveal when this scene happened but it would make sense if it was during the Battle of Titan where Dr. Strange, Tony Stark, Spider man and the Guardians of the Galaxy nearly managed to subdue Thanos.
You can now streaming Avengers: Infinity War on Nextflix and Avengers: Endgame on Disney+.