Can I build a deck together with friends on TCGSwap?

Yes. Every deck on TCGSwap has a Collaboration Space. You can invite up to 5 friends; they can suggest card changes, discuss ideas, and playtest proposals. You review and apply suggestions before anything changes in your deck.

How does deck collaboration work?

It works like a pull request for your deck. Collaborators open the deck editor, make their proposed changes, and submit a suggestion with a note. You get notified, open the comparison view to see exactly what they changed, and choose to apply all, cherry-pick individual cards, or decline. Nothing changes in your deck until you approve it.

Can collaborators chat and discuss the deck?

Yes. The Collaboration Space has a shared group discussion thread for the whole deck, plus a per-suggestion Q&A thread for each proposal. You can @mention teammates and link specific cards inline.

Is collaborative deck building free?

Yes, collaboration is free for all TCGSwap users during beta. You can invite up to 5 collaborators per deck.

Does TCGSwap work for MTG, Pokémon, Yu-Gi-Oh and One Piece collaboration?

Yes. The Collaboration Space supports all four games — Magic: The Gathering, Pokémon TCG, Yu-Gi-Oh and One Piece. Format validation and card prices are included for each game.

Number 69: Heraldry Crest - Dark Matter Demolition · Alliance Insight 77571454/100

Number 69: Heraldry Crest - Dark Matter Demolition (Alliance Insight 77571454/100), Quarter Century Secret Rare. Market price $0.31, down 6.1% this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

5 Level 4 monsters Cannot be destroyed by battle or card effects. Once per turn (Quick Effect): You can detach 1 material from this card, then target 1 face-up monster your opponent controls; that monster's name becomes "Unknown". Negate any "Unknown" effects activated by your opponent.

Weekly price history

Week	Market price
2026-W31	$0.36
2026-W32	$0.36
2026-W33	$0.33
2026-W34	$0.34
2026-W35	$0.34
2026-W36	$0.33
2026-W37	$0.31

Questions

How much is Number 69: Heraldry Crest - Dark Matter Demolition 77571454/100 worth?

Number 69: Heraldry Crest - Dark Matter Demolition from Alliance Insight (77571454/100) has a market estimate of $0.31, down 6.1% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Number 69: Heraldry Crest - Dark Matter Demolition 77571454/100 rare?

It is a Quarter Century Secret Rare from Alliance Insight, a 100-card set.

Browse more Yu-Gi-Oh cards · All Alliance Insight cards · Build a deck · Track your collection