Yu-Gi-Oh! trading card price guide
Gem-Knight Aquamarine BLMM-EN137
Battles of Legend: Monster Mayhem · Ultra Rare
Card Intelligence
Market activity snapshot
Last 90 days ·
- Catalog-matched online sales observed
- 45 — 90-day observation window
- Liquidity
- Medium — Moderate recent sale activity
- DeckTradr popularity
- Low — Based on aggregated DeckTradr engagement
- Data confidence
- Medium — Based on signal coverage and freshness
$0.19 — DeckTradr online market value · NM · No variant recorded
Steady — Compared with the previous 30-day period
DeckTradr combines privacy-qualified in-person POS activity, catalog-matched online sale observations, and aggregated first-party engagement signals. Counts represent activity available to DeckTradr, not every action or sale across the market.
Card facts
Yu-Gi-Oh! · trading card
Gem-Knight Aquamarine BLMM-EN137 is cataloged as a trading card from Battles of Legend: Monster Mayhem for Yu-Gi-Oh!.
The catalog identifies this item with collector number BLMM-EN137, rarity listed as Ultra Rare, Normal printing.
Available catalog metadata records a release date of June 13, 2025.
Catalog facts
- Game
- Yu-Gi-Oh!
- Set
- Battles of Legend: Monster Mayhem
- Collector number
- BLMM-EN137
- Rarity
- Ultra Rare
- Release date
- June 13, 2025
- Printing
- Normal
- Card type
- Fusion/Effect Monster
Gameplay facts
- Flavor 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.