Gem-Knight Aquamarine

Level 6 EARTH/Aqua Fusion Effect
1400 ATK / 2600 DEF

"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.

Rulings – Yugipedia

Printings:

Duel Terminal 5a: DT05-EN035 (Duel Terminal Super Parallel Rare) - 2011-05-29
Hidden Arsenal 5: Steelswarm Invasion: HA05-EN020 (Secret Rare) - 2011-12-01
Battles of Legend: Monster Mayhem: BLMM-EN137 (Ultra Rare) - 2025-08-28

Prices:

Cardmarket: 0.12 €
TCGplayer: $ 0.14