Gem-Knight Hollowcore

DARK · Fiend / Effect Monster · 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.

Is it legal?

TCGUnlimited (3)

OCGUnlimited (3)

Master DuelUnlimited (3)

Rarity: Super Rare (SR)

Genesys0 points

Price

About $0.32–$0.44 across printings and stores (as of Oct 9, 2026). See listings on TCGplayer · eBay · Cardmarket (EU)

Price history & alerts

Printings

Set	Code	Rarity
Battles of Legend: Monster Mayhem	BLMM-EN022	Secret Rare

Build a deck around Gem-Knight Hollowcore

Genny reads every card ever printed, builds a legal deck around this one, grades it against the current meta, and the simulator can test it hundreds of times.

Build with this card