This might be the first comic publication for this cover image. It was also used on the French novel Dans un Monde Inconnu (Presses Pocket, 1974) #820 by H.G. Konsalik.
Stephen Strange seeks out the Ancient One in Himalayas in hope of a cure for his damaged nerves. He discovers that Mordo, a pupil of the Ancient One, is plotting to kill his teacher. Strange warns the Ancient One and then asks to study the mystic arts.
Gil Kane (credited as Diverse Hands) (page 1); Tom Palmer (credited as Diverse Hands) (pages 2, 3, 6, 7); Bernie Wrightson (credited as Diverse Hands) (pages 4, 5)