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.

Mysterious Fossil · Sandstorm 91/100

Mysterious Fossil (Sandstorm 91/100), Common, 10 HP. Market price €0.34, unchanged this week. Illustrated by Keiji Kinebuchi. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Card text

Play Mysterious Fossil as if it were a Basic Pokémon. While in play, Mysterious Fossil counts as a Colorless Pokémon (instead of a Trainer card). Mysterious Fossil has no attacks of its own, can't retreat, and can't be affected by any Special Conditions. If Mysterious is Knocked Out, it doesn't count as a Knocked Out Pokémon. (Discard it anyway.) At any time during your turn before your attack, you may discard Mysterious Fossil from play.

Weekly price history

Week	Market price
2026-W31	€0.36
2026-W32	€0.35
2026-W33	€0.35
2026-W34	€0.33
2026-W35	€0.33
2026-W36	€0.32
2026-W37	€0.32
2026-W38	€0.34
2026-W39	€0.34

Printings & variants

Normal — $0.62
Reverse Holo — $2.55

Questions

How much is Mysterious Fossil 91/100 worth?

Mysterious Fossil from Sandstorm (91/100) has a market estimate of €0.34, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Mysterious Fossil 91/100 rare?

It is a Common from Sandstorm, a 100-card set.

Is Mysterious Fossil 91/100 tournament legal?

Mysterious Fossil 91/100 has rotated out of the current formats.

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