Oath of Silence
Trap Card
Normal
This card is always treated as a “Cult of the Deep” card.
When your opponent activates a card or effect, while you control a monster that was Special Summoned from the GY: Negate the activation, and if you do, destroy that card, then you can target 1 “Cult of the Deep” monster in your GY; Special Summon it.
You can only use this effect of “Oath of Silence” once per turn.