Taking place after the Battle of New York, Phase 2 introduced the Guardians of the Galaxy, Ant-Man and The Wasp, Falcon, Scarlet Witch, Vision, and a short-lived Quicksilver. This Phase of the Marvel universe was colored by more ground-level action when it wasn’t focusing on an infinity stone, but the infinity stones still permeated through the Phase 2 films. Thor: The Dark World featured a plot revolving around the Aether, or the “reality” stone, and Guardians of the Galaxy had a story featuring the power stone. The world-building was done mainly in those two movies, with the rest of the Phase being more self-contained when it came to infinity stones.
Phase 3, which includes Captain America: Civil War through Spider-Man: Far From Home, has a lot more world-building through infinity stones than its prior Phases. Doctor Strange and Captain Marvel used the stones as a center point for their plots, culminating in Infinity War and Endgame. Bruce Campbell admits he turned down major roles in the Marvel Cinematic Universe before Sam Raimi joined the franchise with Doctor Strange in the Multiverse of Madness. The actor is well known for appearing in Raimi’s various films, most notably as Ash Williams in the Evil Dead franchise. Campbell has also made cameo appearances in each installment of Raimi’s Spider-Man trilogy, playing a different small part every time opposite Tobey Maguire’s Peter Parker.
When asked if Raimi’s entry into the MCU helped change his decision, Campbell acknowledges, “That does help. I tend to say yes when Sam wants to do something, yes.” The two have a partnership that goes beyond business, so it isn’t surprising that Raimi would be the person who could help Campbell alter his MCU decision. It’s unclear which characters Marvel discussed with Campbell, but it was recently revealed that he almost appeared as Mysterio in the canceled Spider-Man 4. Raimi himself confirmed that a Mysterio design was created for his appearance, citing it as one of the many possibilities for Campbell’s cameo in the movie. However, even that would’ve likely been a small part, perhaps indicating that even when faced with a bigger Marvel character, Campbell really is okay with saying no.