Command Knight

Level 4 FIRE/Warrior Effect Monster
1200 ATK / 1900 DEF

All Warrior monsters you control gain 400 ATK. If you control another monster, monsters your opponent controls cannot target this card for attacks.

Rulings – Yugipedia

Printings:

Collectible Tins 2004: CT1-EN003 (Secret Rare) - 2004-09-01
Dark Beginning 2: DB-EN56 (Common) - 2005-07-27
Dark Beginning 2: DB2-EN114 (Super Rare) - 2005-07-27
Structure Deck: Warrior's Triumph: SD5-EN008 (Common) - 2005-10-28
Duelist League 14 participation cards: DL14-EN002 (Rare) - 2012-06-01
Legendary Collection 3: Yugi's World Mega Pack: LCYW-EN162 (Common) - 2012-09-29
Legendary Decks II: LDK2-ENJ20 (Common) - 2016-10-06
Speed Duel: Scars of Battle: SBSC-EN008 (Common) - 2019-08-01
Speed Duel: Streets of Battle City: SBC1-ENB06 (Common) - 2023-08-24

Prices:

Cardmarket: 0.07 €
TCGplayer: $ 0.06