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.

Archfiend Marmot of Nefariousness · Tournament Pack 6 75889523/20

Archfiend Marmot of Nefariousness (Tournament Pack 6 75889523/20), Common. Market price $2.85, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

An air marmot that has a nefarious horn and wings. It attacks by throwing acorns.

Weekly price history

Week	Market price
2026-W31	$3.02
2026-W32	$3.02
2026-W33	$2.90
2026-W34	$2.90
2026-W35	$2.90
2026-W36	$2.82
2026-W37	$2.85
2026-W38	$2.85
2026-W39	$2.85

Questions

How much is Archfiend Marmot of Nefariousness 75889523/20 worth?

Archfiend Marmot of Nefariousness from Tournament Pack 6 (75889523/20) has a market estimate of $2.85, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Archfiend Marmot of Nefariousness 75889523/20 rare?

It is a Common from Tournament Pack 6, a 20-card set.

Browse more Yu-Gi-Oh cards · All Tournament Pack 6 cards · Build a deck · Track your collection