Gem-Knight Master Diamond is a Quarter Century Secret Rare Fusion Monster card from Yu-Gi-Oh! (Quarter Century Stampede, RA04). Current market price: $0.13.
Quarter Century Secret Rare
Quarter Century Stampede (RA04)
Card Text
3 "Gem-Knight" monsters
Must first be Fusion Summoned. This card gains 100 ATK for each "Gem-" monster in your Graveyard. Once per turn: You can banish 1 Level 7 or lower "Gem-Knight" Fusion Monster from your Graveyard; until the End Phase, this card's name becomes that monster's, and replace this effect with that monster's original effects.
