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.

Demystify · Ninth Edition 13★/710

Demystify (Ninth Edition 13★/710), Common, Instant. Market price €0.39, up 1.6% this week, relatively stable over the last 11 weeks. Illustrated by Christopher Rush. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

First printed in Onslaught on 7 October 2002.

More Demystify printings

Weekly price history

Over the last 11 weeks it has sold for between €0.36 and €0.39. That is up 1.7% from €0.39 10 weeks ago. Right now it is at its highest tracked price.

Week	Market price
2026-W31	€0.39
2026-W32	€0.36
2026-W33	€0.36
2026-W34	€0.38
2026-W35	€0.38
2026-W36	€0.38
2026-W37	€0.38
2026-W38	€0.38
2026-W39	€0.38
2026-W40	€0.39
2026-W41	€0.39

Price in context

Demystify ranks #387 of the 694 priced cards in Ninth Edition. The median Common in the set is €0.31. The 694 priced cards in Ninth Edition are worth €2900.64 together; this card is less than 0.1% of that. The set’s value is up 1.6% this week. Over the last 11 weeks the set’s value went from €2544.72 to €2796.91 (+9.9%).

Top chases in Ninth Edition

Fellwar Stone 297★ — €184.53
Biorhythm 231★ — €85.92
Grave Pact 135★ — €80.33
Seething Song 216★ — €79.13
Underground River 326★ — €71.39

Set value over 11 weeks · same 635 cards each week
Week	Set value
2026-W31	€2544.72
2026-W32	€2565.52
2026-W33	€2535.92
2026-W34	€2565.00
2026-W35	€2554.66
2026-W36	€2575.97
2026-W37	€2623.59
2026-W38	€2670.77
2026-W39	€2673.97
2026-W40	€2751.85
2026-W41	€2796.91