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.

Omastar · Arceus 23/99

Omastar (Arceus 23/99), Rare, Stage2, 120 HP. Market price €1.05, unchanged this week. Illustrated by Hajime Kusajima. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

It is thought that this Pokémon became extinct because its spiral shell grew too large.

Omastar (National Pokédex #139) first appeared in Pokémon Red and Green (1996). Its earliest English cards in our catalogue are from 1999: Fossil.

More Omastar printings

Card text

Time Spiral — Choose 1 of your opponent's Evolved Pokémon. Remove the highest Stage Evolution card from that Pokémon and have your opponent shuffle that card into his or her deck.
Primal Tentacles 30+ — Does 30 damage plus 10 more damage for each Helix Fossil, Dome Fossil, and Old Amber in your discard pile.

Weekly price history

Week	Market price
2026-W31	€0.91
2026-W32	€0.90
2026-W33	€0.90
2026-W34	€0.90
2026-W35	€0.90
2026-W36	€1.01
2026-W37	€1.08
2026-W38	€1.13
2026-W39	€1.05
2026-W40	€1.05

Printings & variants

Normal — $3.88
Reverse Holo — $5.99

Price in context

Omastar ranks #43 of the 105 priced cards in Arceus. The median Rare in the set is €3.54. The 105 priced cards in Arceus are worth €661.40 together; this card is 0.16% of that. The set’s value is unchanged this week. Over the last 10 weeks the set’s value went from €770.55 to €661.40 (-14.2%).

Top chases in Arceus

Ponyta 46 — €61.12
Ponyta 72 — €61.12
Ponyta SH11 — €61.12
Shinx 74 — €52.00
Shinx SH12 — €52.00

Set value over 10 weeks · same 105 cards each week
Week	Set value
2026-W31	€770.55
2026-W32	€755.65
2026-W33	€694.30
2026-W34	€695.21
2026-W35	€696.23
2026-W36	€680.98
2026-W37	€684.18
2026-W38	€646.10
2026-W39	€661.40
2026-W40	€661.40