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.

Gyarados · HeartGold SoulSilver 4/123

Gyarados (HeartGold SoulSilver 4/123), Holo Rare, Stage1, 130 HP. Market price €13.91, up 9.9% this week. Illustrated by Mitsuhiro Arita. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Once it appears, it goes on a rampage. It remains enraged until it demolishes everything around it.

Card text

Hydro Splash 50
Hyper Beam 80 — Discard an Energy card attached to the Defending Pokémon.

Weekly price history

Week	Market price
2026-W31	€12.33
2026-W32	€12.09
2026-W33	€12.09
2026-W34	€12.89
2026-W35	€12.89
2026-W36	€13.48
2026-W37	€13.45
2026-W38	€12.66
2026-W39	€13.91

Printings & variants

Holo — $60.86
Reverse Holo — $69.99

Questions

How much is Gyarados 4/123 worth?

Gyarados from HeartGold SoulSilver (4/123) has a market estimate of €13.91, up 9.9% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Gyarados 4/123 rare?

It is a Holo Rare from HeartGold SoulSilver, a 123-card set.

Is Gyarados 4/123 tournament legal?

Gyarados 4/123 has rotated out of the current formats.

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