It's part of the mystery that Wandvision is not having an apparent opponent.
But Fans have already guessed it through Tony Stark Commercialsneaky placement of '666' on the toaster seen in the commercial during "Episode 1" which is related to DEVIL aka the villain Mephisto,
WHO IS MEPHISTO
Mephisto is a fictional character from Marvel Comics. Which also an animated series. Mephisto is also responsible for capturing and holding Cynthia von Doom's soul. she was Dr. Doom's mother. Mephisto served as the servant of the insane Titan Thanos during the Gems war.
WHO IS MEPHISTO
Mephisto is a fictional character from Marvel Comics. Which also an animated series. Mephisto is also responsible for capturing and holding Cynthia von Doom's soul. she was Dr. Doom's mother. Mephisto served as the servant of the insane Titan Thanos during the Gems war.
If you had any doubts. Please let me know...