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.

Koffing · Base Set 51/102

Koffing (Base Set 51/102), Common, Basic, 50 HP. Market price €1.15, down 1.7% this week. Illustrated by Mitsuhiro Arita. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Because it stores several kinds of toxic gases in its body, it is prone to exploding without warning.

Card text

Foul Gas 10 — Flip a coin. If heads, the Defending Pokémon is now Poisoned; if tails, it is now Confused.

Weekly price history

Week	Market price
2026-W31	€0.86
2026-W32	€1.15
2026-W33	€1.17
2026-W34	€1.39
2026-W35	€1.43
2026-W36	€1.44
2026-W37	€1.29
2026-W38	€1.17
2026-W39	€1.15

Printings & variants

Normal — $0.92

Questions

How much is Koffing 51/102 worth?

Koffing from Base Set (51/102) has a market estimate of €1.15, down 1.7% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Koffing 51/102 rare?

It is a Common from Base Set, a 102-card set.

Is Koffing 51/102 tournament legal?

Koffing 51/102 has rotated out of the current formats.

Browse more Pokémon cards · All Base Set cards · Build a deck · Track your collection