Poseidra, the Atlantean Dragon
Card Number: CR05-AE105
Card Type: Effect
Level: 7
Rarity: N
Attribute: Water
Types: Sea Serpent
ATK: 2800
DEF: 1600

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.