Gem-Knight Hollowcore
Gem-Knight Hollowcore is a Effect Monster in the Gem- archetype, first released in 2025 in Battles of Legend: Monster Mayhem. It has 1 printing across 1 set (Secret Rare). BLMM-EN022 Secret Rare sells for about $0.32. In the TCG it is currently unlimited (3 copies).
Market price · TCGPlayer
Updated Oct 1, 2026
$0.32
Type
Fiend
Level
7
ATK
1950
DEF
2450
You can send 1 "Gem-Knight" Normal Monster or 1 "Gem-Knight Fusion" from your Deck to the GY; Special Summon this card from your hand in Defense Position. When your opponent activates a card or effect, while you control a "Gem-Knight" Fusion Monster (Quick Effect): You can banish 3 "Gem-Knight" cards from your GY, including this card; negate that effect, then all "Gem-Knight" monsters you currently control gain 1000 ATK. You can only use each effect of "Gem-Knight Hollowcore" once per turn.
Appears in 1 expansion
Printings (1)
| expansion | Code | Rarity | Price | Buy |
|---|---|---|---|---|
| Battles of Legend: Monster Mayhem | BLMM-EN022 | Secret Rare | $0.32 |
Gem-Knight Hollowcore: FAQ
How much is Gem-Knight Hollowcore worth?+
Gem-Knight Hollowcore currently sells for $0.32 on TCGPlayer. The exact value depends on the printing, rarity, edition and condition — scan the card with YuScan to see the price of your copy.
Which sets was Gem-Knight Hollowcore printed in?+
Gem-Knight Hollowcore appears in 1 set: Battles of Legend: Monster Mayhem.
Is Gem-Knight Hollowcore legal in tournaments?+
On the current TCG Forbidden & Limited List, Gem-Knight Hollowcore is unlimited (3 copies).
What is the passcode of Gem-Knight Hollowcore?+
The 8-digit passcode printed on Gem-Knight Hollowcore is 88225269.
Gem-
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