Abyss Dweller

[ Sea Serpent / Xyz / Effect ] 2 Level 4 monsters While this card has a material attached that was originally WATER, all WATER monsters you control gain 500 ATK. Once per turn (Quick Effect): You can detach 1 material from this card; your opponent cannot activate any card effects in their GY this turn. ATK/ 1700 DEF/ 1400