Abyss Dweller
Sea Serpent / Xyz / Effect
WATER / 
42 Level 4 monsters
While this card has an Xyz Material attached that was originally WATER, all WATER monsters you control gain 500 ATK. Once per turn, during either player's turn: You can detach 1 Xyz Material from this card; any card effects that activate in your opponent's Graveyard cannot be activated this turn.
1700/1400
CARD ID: 21044178
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| TCG Set | Symbol | Rarity | Low | Avg | Trend | |
|---|---|---|---|---|---|---|
| Abyss Rising | ABYR-EN084 | Super Rare | 3.39€ | 4.55€ | 4.35€ | |
| Duel Devastator | DUDE-EN016 | Ultra Rare | - | - | - | |
| Premium Gold: Infinite Gold | PGL3-EN068 | Gold Rare | 2.39€ | 3.34€ | 3.83€ | |
| The Secret Forces | THSF-EN047 | Super Rare | 1.70€ | 2.84€ | 3.25€ |
This is the first TCG exclusive Sea Serpent-Type Xyz Monster, and the third TCG exclusive Sea Serpent-Type monster in general.
This card is a Xyz counterpart of The Dragon Dwelling in the Deep, having the same appearance and stats: Level/Rank, Attribute, ATK, and DEF.
The Dragon Dwelling in the Deep was also a TCG exclusive monster.
This could be also be the WATER counterpart to Dweller in the Depthsand The Thing in the Crater.
This card is a Xyz counterpart of The Dragon Dwelling in the Deep, having the same appearance and stats: Level/Rank, Attribute, ATK, and DEF.
The Dragon Dwelling in the Deep was also a TCG exclusive monster.
This could be also be the WATER counterpart to Dweller in the Depthsand The Thing in the Crater.
OCG Rulings
Detaching 1 Xyz Material from this card is a cost to activate the "any card effects that activate in your opponent's Graveyard cannot be activated this turn." effect.: Abyss Dweller
The "any card effects that activate in your opponent's Graveyard cannot be activated this turn." effect cannot be activated during the Damage Step.