Magician of Black Chaos MAX

Per-phrase breakdown

• You can Ritual Summon this card with "Chaos Form". (Summoning condition)
• If this card is Special Summoned: You can Tribute 1 monster; your opponent cannot activate monster effects this turn. (Trigger)
• When this card destroys an opponent's monster by battle: You can target 1 Spell in your GY; add it to your hand. (Trigger)
• You can only use each effect of "Magician of Black Chaos MAX" once per turn. (Condition)

Judge-facing facts

• Ritual Effect Monster, Level 8
• Can be Ritual Summoned with Chaos Form
• The effect to prevent the opponent from activating monster effects is a Trigger Effect
• The effect to add a Spell from the GY is a Trigger Effect
• You can only use each effect of Magician of Black Chaos MAX once per turn

Card-specific notes from database

• (Konami neuron) The effect preventing the opponent from activating monster effects can be activated during the Damage Step
• (Konami neuron) You can Tribute this card itself or a face-down Defense Position monster to pay the activation cost
• (Konami neuron) The restriction applies to the opponent player, not their monsters; they cannot activate monster effects even if their monsters are unaffected by card effects
• (Konami neuron) The effect to add a Spell from the GY activates at the end of the Damage Step
• (Konami neuron) This card must remain face-up in the Monster Zone at the end of the Damage Step to activate its GY retrieval effect; it cannot activate if destroyed by mutual battle
• (YGOResources) When Ritual Summoning this card with Secrets of Dark Magic, you cannot Tribute both Dark Magician and a Level 8 monster, because the Level 8 monster satisfies the Level requirement alone