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.

Sea Monster · Seventh Edition 97★/708

Sea Monster (Seventh Edition 97★/708), Common, Creature — Serpent. Market price €3.36, up 1.6% this week. Illustrated by John Howe. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

First printed in Tempest on 14 October 1997.

More Sea Monster printings

Sea Monster · Tenth Edition — €0.11
Sea Monster · Ninth Edition — €0.09
Sea Monster · Ninth Edition
Sea Monster · Eighth Edition — €0.04
Sea Monster · Eighth Edition — €0.29
Sea Monster · Seventh Edition — €0.11
Sea Monster · Classic Sixth Edition — €0.18
Sea Monster · Tempest — €0.07

Weekly price history

Over the last 11 weeks it has sold for between €2.67 and €6.66. That is down 49.5% from €6.66 10 weeks ago. Right now it is 50% below its tracked high.

Week	Market price
2026-W31	€6.66
2026-W32	€2.68
2026-W33	€2.67
2026-W34	€2.67
2026-W35	€3.23
2026-W36	€3.25
2026-W37	€3.24
2026-W38	€3.26
2026-W39	€3.28
2026-W40	€3.31
2026-W41	€3.36

Price in context

Sea Monster ranks #342 of the 708 priced cards in Seventh Edition. The median Common in the set is €0.95. The 708 priced cards in Seventh Edition are worth €24519.58 together; this card is less than 0.1% of that. The set’s value is up 1.9% this week. Over the last 11 weeks the set’s value went from €20490.48 to €22417.57 (+9.4%).

Top chases in Seventh Edition

Birds of Paradise 231★ — €3552.97
Final Fortune 182★ — €1685.90
City of Brass 327★ — €1338.80
Adarkar Wastes 325★ — €937.17
Brushland 326★ — €874.68

Set value over 11 weeks · same 695 cards each week
Week	Set value
2026-W31	€20490.48
2026-W32	€20370.30
2026-W33	€20456.74
2026-W34	€20461.35
2026-W35	€20341.40
2026-W36	€20675.97
2026-W37	€20537.03
2026-W38	€21282.98
2026-W39	€21437.87
2026-W40	€21981.61
2026-W41	€22417.57