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.

Harpie's Pet Phantasmal Dragon · Lord of the Tachyon Galaxy Sneak Peek Participation Card 85909450/1

Harpie's Pet Phantasmal Dragon (Lord of the Tachyon Galaxy Sneak Peek Participation Card 85909450/1), Rare. Market price $0.46, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

3 Level 4 WIND monsters This card's effects can only be applied/resolved while it has Xyz Material. This card can attack your opponent directly. Your opponent cannot target any "Harpie" monsters with effects or for attacks. During each of your End Phases: Detach 1 Xyz Material from this card.

Weekly price history

Week	Market price
2026-W31	$0.42
2026-W32	$0.43
2026-W33	$0.44
2026-W34	$0.47
2026-W35	$0.47
2026-W36	$0.45
2026-W37	$0.48
2026-W38	$0.46
2026-W39	$0.46

Questions

How much is Harpie's Pet Phantasmal Dragon 85909450/1 worth?

Harpie's Pet Phantasmal Dragon from Lord of the Tachyon Galaxy Sneak Peek Participation Card (85909450/1) has a market estimate of $0.46, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Harpie's Pet Phantasmal Dragon 85909450/1 rare?

It is a Rare from Lord of the Tachyon Galaxy Sneak Peek Participation Card, a 1-card set.

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