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.

Undersea Ruins · Aquapolis 138/147

Undersea Ruins (Aquapolis 138/147), Uncommon. Market price €2.63, down 5.1% this week. Illustrated by Midori Harada. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Card text

This card stays in play when you play it. Discard this card if another Stadium card comes into play. Once during each player's turn (before attacking), that player may flip a coin. If heads, that player chooses 1 of his or her Evolved Pokémon in play and discards the top Evolution card from that Pokémon, devolving it.

Weekly price history

Week	Market price
2026-W31	€2.69
2026-W32	€2.69
2026-W33	€2.69
2026-W34	€2.73
2026-W35	€2.73
2026-W36	€2.73
2026-W37	€2.77
2026-W38	€2.77
2026-W39	€2.63

Printings & variants

Normal — $6.06
Reverse Holo — $14.99

Questions

How much is Undersea Ruins 138/147 worth?

Undersea Ruins from Aquapolis (138/147) has a market estimate of €2.63, down 5.1% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Undersea Ruins 138/147 rare?

It is an Uncommon from Aquapolis, a 147-card set.

Is Undersea Ruins 138/147 tournament legal?

Undersea Ruins 138/147 has rotated out of the current formats.

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