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.

Heavy Polymerization · 25th Anniversary Tin: Dueling Mirrors 58570206/398

Heavy Polymerization (25th Anniversary Tin: Dueling Mirrors 58570206/398), Prismatic Secret Rare. Market price $0.18, up 5.9% this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Fusion Summon 1 Fusion Monster from your Extra Deck, using 3 or more monsters from your hand or field as material. You can also banish monsters from your Extra Deck as material, up to the number of monsters your opponent controls, but you lose LP equal to the total ATK of monsters banished this way, when the monster is Fusion Summoned.

Weekly price history

Week	Market price
2026-W31	$0.22
2026-W32	$0.20
2026-W33	$0.20
2026-W34	$0.17
2026-W35	$0.17
2026-W36	$0.17
2026-W37	$0.18

Questions

How much is Heavy Polymerization 58570206/398 worth?

Heavy Polymerization from 25th Anniversary Tin: Dueling Mirrors (58570206/398) has a market estimate of $0.18, up 5.9% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Heavy Polymerization 58570206/398 rare?

It is a Prismatic Secret Rare from 25th Anniversary Tin: Dueling Mirrors, a 398-card set.

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