Effect
Once per turn, if the battle position of this face-up card on the field is changed: Send 1 WATER monster from your Deck to the GY.
The monster effect of "Knight of the Abyss" is a Trigger Effect.
It does not target.
This effect must be activated when the battle position of a face-up "Knight of the Abyss" in the Monster Zone is changed. (It also activates during the Damage Step.)
The monster effect of "Knight of the Abyss" does not activate if a face-down Defense Position "Knight of the Abyss" is flipped face-up, or if a face-up "Knight of the Abyss" is changed to face-down Defense Position by the effect of "Book of Moon".
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