Gem-Knight Hollowcore

Effect Monster

Gem-Knight Hollowcore is a Effect Monster (DARK/Fiend, Level 7) with 1950 ATK / 2450 DEF. First printed in Battles of Legend: Monster Mayhem (2025).

Type: Effect Monster
Attribute: DARK
Monster type: Fiend
Level: 7
ATK / DEF: 1950 / 2450
Archetype: Gem-
Banlist: Unlimited in the TCG, OCG, and Master Duel
TCG release: 2025-06-13
Printings: 1

Card text

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.

Approximate value

≈$0.48

A rough figure from recent listings (updated 2026-06-09), not a market value or official price. It varies a lot with printing, condition, edition, rarity, and grading. Check current listings below before buying or selling.

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Printings & rarities

All printings →

Set	Set code	Rarity	Release	Price*
Battles of Legend: Monster Mayhem	BLMM-EN022	Secret Rare	2025-08-28	$0.48

*Approximate, from recent marketplace listings, not market values.