You can Tribute this card and 1 Sea Serpent-Type monster; Special Summon 1 "Poseidra, the Atlantean Dragon" from your hand or Deck, then all monsters your opponent currently controls lose 300 ATK.
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Number:LTGY-EN033
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Rarity:Common
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Attribute Monster Type/Card Type:WATER Sea-Serpent/Effect Monster
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Level:3
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A / D:1600 / 800