The Illuminati vs The Cabal
This isn't a straight-up fight. Both teams are given the objective of eliminating every opposing member of the opposite team. The Illuminati has its base in New York in Stark's tower. While the Cabal has its base in Latveria in Doom's castle. Which team would succeed? Assume both teams work well together.
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Illuminati: Iron Man, Reed Richards, Professor X, Dr. Strange, and Black Bolt
vs
Cabal: Norman Osborn, Dr. Doom, Emma Frost, Loki, and The Hood