Poseidra, the Atlantean Dragon is a Ultra Rare Effect Monster card from Yu-Gi-Oh! (Realm of the Sea Emperor Structure Deck, SDRE). Current market price: $0.89.
Ultra Rare
Realm of the Sea Emperor Structure Deck (SDRE)
Card Text
You can Tribute 3 Level 3 or lower WATER monsters; Special Summon this card from your hand or Graveyard. When you do: Return all Spell and Trap Cards on the field to the hand, and if you do, if 3 or more cards are returned to the hand by this effect, all monsters your opponent currently controls lose 300 ATK for each.
