Abyss Dweller – (Rare)- (Crossover Breakers) – (CRBR-EN012)

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.