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?

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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.

Mountain · Ninth Edition 345★/710

Mountain (Ninth Edition 345★/710), Common, Basic Land — Mountain. Market price €3.01, up 1.6% this week. Illustrated by John Avon. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

First printed in Limited Edition Alpha on 5 August 1993.

More Mountain printings

Mountain · The Hobbit — €0.14
Mountain · Teenage Mutant Ninja Turtles — €0.21
Mountain · The Hobbit — €0.30
Mountain · Teenage Mutant Ninja Turtles — €0.32
Mountain · Secrets of Strixhaven — €0.53
Mountain · Lorwyn Eclipsed — €0.19
Mountain · Lorwyn Eclipsed — €0.22
Mountain · Secrets of Strixhaven — €0.14
Mountain · Secrets of Strixhaven — €0.14
Mountain · Lorwyn Eclipsed — €0.29
Mountain · Marvel Super Heroes — €0.23
Mountain · Marvel Super Heroes — €0.21

Weekly price history

Over the last 11 weeks it has sold for between €2.92 and €3.19. That is up 1.7% from €2.96 10 weeks ago. Right now it is 6% below its tracked high.

Week	Market price
2026-W31	€2.96
2026-W32	€2.92
2026-W33	€3.17
2026-W34	€3.16
2026-W35	€3.14
2026-W36	€3.16
2026-W37	€3.15
2026-W38	€3.17
2026-W39	€3.19
2026-W40	€2.96
2026-W41	€3.01

Price in context

Mountain ranks #157 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 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