Maître Diamant, Chevalier-Gemmes SP15-FR030

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 of this turn, this card's name becomes that monster's name, and replace this effect with that monster's original effects.