Gishki Shadow (HA05-EN036)

If you Ritual Summon exactly 1 WATER Ritual Monster with a card effect that requires use of monsters, this card can be used as the entire requirement. You can discard this card; add 1 "Gishki" Ritual Spell Card from your Deck to your hand.

Sea Serpent / Effect, Hidden Arsenal 5: Steelswarm Invasion