Gem-Knight Garnet + 1 Gem-Knight monster
This monster can only be Special Summon by Fusion Summoned (from the Extra Deck) using the above cards as Fusion Material Monsters. Once per turn: You can Tribute 1 face-up Gem- monster to have this card gains ATK equal to the Tributed monster s ATK, until the End Phase. During battle between this attaching card and a Defense Position monster whose DEF is lower than the ATK of this card, inflict the difference as Battle Damage to your opponent.