Dragon Master Knight

Level 12 LIGHT/Dragon Fusion Monster
5000 ATK / 5000 DEF

"Black Luster Soldier" + "Blue-Eyes Ultimate Dragon"
Must be Fusion Summoned. This card gains 500 ATK for each Dragon monster you control, except this card.

Rulings – Yugipedia

Printings:

Ultimate Edition 2: UE02-EN001 (Ultra Rare) - 2006-11-11
Retro Pack 2: RP02-EN097 (Secret Rare) - 2009-07-28
Duelist Pack: Kaiba: DPKB-EN027 (Ultra Rare) - 2010-04-16
Legendary Collection 3: Yugi's World Mega Pack: LCYW-EN050 (Super Rare) - 2012-09-29
Duelist Pack: Rivals of the Pharaoh: DPRP-EN012 (Rare) - 2016-09-15
Legendary Collection Kaiba Mega Pack: LCKC-EN065 (Secret Rare) - 2018-03-08

Prices:

Cardmarket: 1.25 €
TCGplayer: $ 1.47