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.

Shell Knight · Ghosts From the Past: The 2nd Haunting 10163855/187

Shell Knight (Ghosts From the Past: The 2nd Haunting 10163855/187), Ultra Rare. Market price $0.21, up 10.5% this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

When this card is Normal Summoned: You can change this card to Defense Position, and if you do, inflict 500 damage to your opponent. If this card is destroyed by battle or sent to the GY by a card effect: You can add 1 Level 8 Rock monster from your Deck to your hand, or if "Fossil Fusion" is in your GY, you can Special Summon it instead. For the rest of this turn, you cannot activate cards, or the effects of cards, with the same name as that card. You can only use this effect of "Shell Knight" once per turn.

Weekly price history

Week	Market price
2026-W31	$0.21
2026-W32	$0.21
2026-W33	$0.20
2026-W34	$0.22
2026-W35	$0.22
2026-W36	$0.21
2026-W37	$0.19
2026-W38	$0.19
2026-W39	$0.21

Questions

How much is Shell Knight 10163855/187 worth?

Shell Knight from Ghosts From the Past: The 2nd Haunting (10163855/187) has a market estimate of $0.21, up 10.5% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Shell Knight 10163855/187 rare?

It is an Ultra Rare from Ghosts From the Past: The 2nd Haunting, a 187-card set.

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