Sea Serpent [Alpha Edition] BW88 ) If this card is

) If this card is selected as an attack target

Set: Astral Pack 4 Card type: Effect Monster Rarity: Super Rare Neither player can Normal or Special Summon DARK monsters or declare an attack with a DARK monster

You can send 1 Equip Spell Card equipped to this card to the Graveyard to select and remove from play up to 3 monsters in your opponent's Graveyard

and furthermore

Sea Serpent [Alpha Edition] BW88 ) If this card isSet: Alpha Edition Type: Creature Serpent Rarity: Common Cost: {5}{U} Sea Serpent can't attack unless defending player controls an Island. When you control no Islands, sacrifice Sea Serpent. Legend has it that Serpents used to be bigger, but how could that be?