The Legendary Fisherman III #DOCS-EN017

WaterMonster

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by Tributing 1 "The Legendary Fisherman", and cannot be Special Summoned by other ways. When this card is Special Summoned: You can banish all monsters your opponent controls, but this card cannot attack for the rest of this turn. Cannot be destroyed by battle or card effects, and is unaffected by Spell/Trap effects. Once per turn: You can return all of your opponent's banished cards to the Graveyard, and if you do, double the next battle or effect damage your opponent would take this turn.