Knightmare Mermaid

Level 0 WATER/Fiend Link Monster
1000 ATK

1 "Knightmare" monster, except "Knightmare Mermaid"
If this card is Link Summoned: You can discard 1 card; Special Summon 1 "Knightmare" monster from your Deck, then, if this card was co-linked when this effect was activated, you can draw 1 card. You can only use this effect of "Knightmare Mermaid" once per turn. Monsters on the field lose 1000 ATK/DEF, unless they are co-linked.

Rulings – Yugipedia

Printings:

Flames of Destruction: FLOD-EN043 (Rare) - 2018-05-03
2019 Gold Sarcophagus Tin Mega Pack: MP19-EN025 (Prismatic Secret Rare) - 2019-08-29

Prices:

Cardmarket: 0.27 €
TCGplayer: $ 0.28