Gem-Knight Aquamarine [DT05-EN035] Super Rare

"Gem-Knight Sapphire" + 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. 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, select 1 card your opponent controls and return it to the hand.