The Phantom Knights of Ancient Cloak

Level 3 DARK/Warrior Effect
800 ATK / 1000 DEF

If this card is in Attack Position: You can target 1 DARK monster on the field; change this card to Defense Position, and if you do, that monster gains 800 ATK/DEF until the end of your opponent's turn. You can banish this card from your GY; add 1 "The Phantom Knights" card from your Deck to your hand, except "The Phantom Knights of Ancient Cloak". You can only use each effect of "The Phantom Knights of Ancient Cloak" once per turn.

Rulings – Yugipedia

Printings:

Wing Raiders: WIRA-EN001 (Ultra Rare) - 2016-02-11
Battles of Legend: Relentless Revenge: BLRR-EN061 (Secret Rare) - 2018-06-28
Legendary Hero Decks: LEHD-ENC01 (Common) - 2018-10-04
OTS Tournament Pack 14: OP14-EN017 (Common) - 2020-10-08
OTS Tournament Pack 14 (POR): OP14-PT017 (Common) - 2020-10-08
Maximum Gold: El Dorado: MGED-EN078 (Rare) - 2021-11-18
Battles of Legend: Chapter 1: BLC1-EN115 (Common) - 2024-02-22
Quarter Century Stampede: RA04-EN263 (Platinum Secret Rare) - 2025-04-10
Quarter Century Stampede: RA04-EN263 (Quarter Century Secret Rare) - 2025-04-10

Prices:

Cardmarket: 0.11 €
TCGplayer: $ 0.10