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.

Mamoswine · Crimson Invasion 21/111

Mamoswine (Crimson Invasion 21/111), Rare, Stage2, 180 HP. Market price €0.29, unchanged this week. Illustrated by Mitsuhiro Arita. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

A frozen Mamoswine was dug from ice dating back 10,000 years. This Pokémon has been around a long, long, long time.

Card text

Double Stomp 60+ — Flip 2 coins. This attack does 30 more damage for each heads.
Forceful Tackle 90+ — You may put up to 9 damage counters on this Pokémon. This attack does 10 more damage for each damage counter you placed in this way.

Weekly price history

Week	Market price
2026-W31	€0.27
2026-W32	€0.26
2026-W33	€0.26
2026-W34	€0.28
2026-W35	€0.28
2026-W36	€0.28
2026-W37	€0.28
2026-W38	€0.29
2026-W39	€0.29

Printings & variants

Normal — $0.33

Questions

How much is Mamoswine 21/111 worth?

Mamoswine from Crimson Invasion (21/111) has a market estimate of €0.29, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Mamoswine 21/111 rare?

It is a Rare from Crimson Invasion, a 111-card set.

Is Mamoswine 21/111 tournament legal?

Mamoswine 21/111 is legal in Expanded.

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