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.

Happiny · Mysterious Treasures 52/123

Happiny (Mysterious Treasures 52/123), Uncommon, Basic, 60 HP. Market price €2.85, unchanged this week. Illustrated by Yuka Morii. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

It loves round white things. It carries and egg-shaped rock in imitation of CHANSEY.

Happiny (National Pokédex #440) first appeared in Pokémon Diamond and Pearl (2006). Its earliest English cards in our catalogue are from 2007: Mysterious Treasures.

More Happiny printings

Card text

Poke-POWER: Baby Evolution — Once during your turn (before your attack), you may put Chansey from your hand onto Happiny (this counts as evolving Happiny) and remove all damage counters from Happiny.
Lively — Remove 2 damage counters from 1 of your Pokémon.

Weekly price history

Week	Market price
2026-W31	€2.17
2026-W32	€2.48
2026-W33	€2.57
2026-W34	€2.80
2026-W35	€2.80
2026-W36	€2.99
2026-W37	€3.07
2026-W38	€2.88
2026-W39	€2.85
2026-W40	€2.85

Printings & variants

Normal — $9.78
Reverse Holo — $24.98

Price in context

Happiny ranks #23 of the 119 priced cards in Mysterious Treasures. The median Uncommon in the set is €0.31. The 119 priced cards in Mysterious Treasures are worth €393.93 together; this card is 0.72% of that. The set’s value is unchanged this week. Over the last 10 weeks the set’s value went from €343.84 to €393.93 (+14.6%).

Top chases in Mysterious Treasures

Lucario 122 — €83.21
Time-Space Distortion 124 — €49.76
Magmortar 123 — €44.36
Electivire 121 — €30.45
Alakazam 2 — €24.44

Set value over 10 weeks · same 119 cards each week
Week	Set value
2026-W31	€343.84
2026-W32	€343.12
2026-W33	€343.75
2026-W34	€366.58
2026-W35	€366.63
2026-W36	€384.02
2026-W37	€386.60
2026-W38	€390.99
2026-W39	€393.93
2026-W40	€393.93