A little earlier, the two had learned from Mephisto how Dream Power Doctor Strange had been trapped. If they wanted to destroy someone's mind, nightmares were best; but if they wanted to trap someone, beautiful dreams were the obvious choice, because no one wanted to wake from one.
Mephisto had given Nightmare this suggestion, guiding Dream Power Doctor Strange step by step into his beautiful dream. He had successfully made him forget that it was a dream and immerse himself in his own wonderful fantasy, thereby trapping him.
But Dream Power Doctor Strange was not so easily dealt with. He had actually sensed something was wrong. However, after obtaining most of the Dream Power, Nightmare had made the dream exceptionally complete. Even if he noticed the problem, escaping would not be easy. Greed and Agent had come to give him a hand.
Greed knew Strange very well. Most versions of Strange looked glorious after becoming Sorcerer Supreme—leading Kamar-Taj, joining the Illuminati, wielding considerable influence on Earth—but being unable to continue their careers as Doctors was their eternal pain.
Even a Strange who would pile up a month's worth of medical records until the last day, then have Greed write them for him, would unfailingly bring records to catch up on during Doctor Strange's Battleworld gatherings. He did it just to enjoy those seemingly disdainful yet deeply envious looks, which showed how profound their obsession was.
A person becoming even more successful after already succeeding would not leave much of an impression. But the journey from failure to success would absolutely stay with someone for life. That was how it was for Stephen Strange.
Becoming Sorcerer Supreme after becoming God's Hand was merely icing on the cake. Going from an obscure small-town boy to the world-famous God's Hand had been the