- Chaos King Archfiend switches the entire ATK and DEF of your opponent’s monsters, including any boosts from Continuous Effects. For example, Command Knight boosts its own ATK to 1600 with its effect. If it’s then affected by Chaos King Archfiend it will have 1900 ATK and 1600 DEF. The Continuous Effect will not reapply to the new ATK.
- The effect of Chaos King Archfiend changes the current ATK and DEF of the monster, not the original ATK and DEF.
- When applying the monster effect of "Chaos King Archfiend", you can swap the ATK and DEF of all face-up monsters in your opponent's Monster Zones until the end of the Battle Phase.
- The ATK and DEF replaced by the monster effect of "Chaos King Archfiend" are not treated as the original ATK and DEF.
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