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.

Biorhythm · Ninth Edition 231★/710

Biorhythm (Ninth Edition 231★/710), Rare, Sorcery. Market price $93.24, unchanged this week. Illustrated by Ron Spears. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

First printed in Onslaught on 7 October 2002.

More Biorhythm printings

Biorhythm · Ninth Edition — $34.64
Biorhythm · Onslaught — $35.94

Weekly price history

Week	Market price
2026-W31	$77.48
2026-W32	$115.49
2026-W33	$59.99
2026-W34	$59.99
2026-W35	$59.99
2026-W36	$59.99
2026-W37	$90.62
2026-W38	$93.24
2026-W39	$93.24
2026-W40	$93.24

Price in context

Biorhythm ranks #2 of the 693 priced cards in Ninth Edition. The median Rare in the set is $3.04. The 693 priced cards in Ninth Edition are worth $3229.82 together; this card is 2.89% of that. The set’s value is up 1.3% this week. Over the last 10 weeks the set’s value went from $2903.17 to $3118.98 (+7.4%).

Top chases in Ninth Edition

Fellwar Stone 297★ — $206.75
Biorhythm 231★ — $93.24 (This card)
Grave Pact 135★ — $90.00
Seething Song 216★ — $88.66
Underground River 326★ — $79.99

Set value over 10 weeks · same 638 cards each week
Week	Set value
2026-W31	$2903.17
2026-W32	$2964.34
2026-W33	$2935.27
2026-W34	$2978.62
2026-W35	$2984.77
2026-W36	$2992.11
2026-W37	$3054.15
2026-W38	$3090.02
2026-W39	$3077.40
2026-W40	$3118.98