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.

Houndoom EX · BREAKthrough 21/162

Houndoom EX (BREAKthrough 21/162), Ultra Rare, Basic, 170 HP. Market price €6.68, down 0.6% this week. Illustrated by Eske Yoshinob. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Card text

Melting Horn — Discard the top 2 cards of your opponent's deck.
Grand Flame 50 — Attach a Fire Energy card from your discard pile to 1 of your Benched Pokémon.

Weekly price history

Week	Market price
2026-W31	€5.69
2026-W32	€6.12
2026-W33	€6.12
2026-W34	€6.46
2026-W35	€6.46
2026-W36	€6.37
2026-W37	€6.68
2026-W38	€6.72
2026-W39	€6.68

Questions

How much is Houndoom EX 21/162 worth?

Houndoom EX from BREAKthrough (21/162) has a market estimate of €6.68, down 0.6% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Houndoom EX 21/162 rare?

It is an Ultra Rare from BREAKthrough, a 162-card set.

Is Houndoom EX 21/162 tournament legal?

Houndoom EX 21/162 is legal in Expanded.

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