Gem-Knight Aquamarine is a Secret Rare Fusion Monster card from Yu-Gi-Oh! (Hidden Arsenal 5: Steelswarm Invasion, HA05). Current market price: $0.14.
Secret Rare
Hidden Arsenal 5: Steelswarm Invasion (HA05)
Card Text
"Gem-Knight Sapphire" + 1 "Gem-Knight" monster
Must first be Fusion Summoned with the above Fusion Material Monsters. If this card attacks, it is changed to Defense Position at the end of the Battle Phase. When this card is sent from the field to the Graveyard: Target 1 card your opponent controls; return that target to the hand.
