Ars Magna "Philosophorum"

Per-phrase breakdown

• Target up to 3 "Ars Magna" monsters in your field or GY; banish them, then until the end of this turn, you can negate the effects of up to that many other face-up cards on the field. (Effect)
• You can banish this card from your GY; return 1 "Power Patron" Link Monster from your GY to the Extra Deck, then you can Special Summon it. (Quick-like)
• You can only use 1 "Ars Magna "Philosophorum"" effect per turn, and only once that turn. (Condition)

Judge-facing facts

• The first effect is applied when this Trap Card is activated.
• The second effect is an activated effect that activates in the Graveyard.
• Neither effect can be activated during the Damage Step.
• You can only use 1 'Ars Magna "Philosophorum"' effect per turn, and only once that turn.

Card-specific notes from database

• For the first effect, banishing the targeted monsters and negating effects do not happen simultaneously (Konami neuron).
• If some targets of the first effect are no longer valid at resolution, the effect is still applied to the remaining valid targets (Konami neuron).
• If the first effect targets at least 1 card in the GY, 'Ghost Belle & Haunted Mansion' can be chained. If it only targets cards on the field, 'Ghost Belle & Haunted Mansion' cannot be chained (YGOResources).
• For the second effect, returning the monster to the Extra Deck and Special Summoning it do not happen simultaneously (Konami neuron).