Gishki Shadow

Level 4 WATER/Sea Serpent Effect Monster
1200 ATK / 1000 DEF

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.

Rulings – Yugipedia

Printings:

Duel Terminal 5b: DT05-EN069 (Duel Terminal Normal Parallel Rare) - 2011-09-29
Hidden Arsenal 5: Steelswarm Invasion: HA05-EN036 (Super Rare) - 2011-12-01
The Secret Forces: THSF-EN042 (Super Rare) - 2015-02-12

Prices:

Cardmarket: 0.15 €
TCGplayer: $ 0.13