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.

Castform · Chilling Reign 121/198

Castform (Chilling Reign 121/198), Common, Basic, 70 HP. Market price €0.06, down 25.0% this week. Illustrated by Asako Ito. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Its form changes depending on the weather. The rougher conditions get, the rougher Castform's disposition!

Card text

Ability: Weather Reading — If you have 8 or more Stadium cards in your discard pile, ignore all Energy in this Pokémon's attack costs.
Weather Force 80 — Draw cards until you have 6 cards in your hand.

Weekly price history

Week	Market price
2026-W31	€0.07
2026-W32	€0.07
2026-W33	€0.07
2026-W34	€0.08
2026-W35	€0.08
2026-W36	€0.07
2026-W37	€0.07
2026-W38	€0.08
2026-W39	€0.06

Printings & variants

Normal — $0.27
Reverse Holo — $0.57

Questions

How much is Castform 121/198 worth?

Castform from Chilling Reign (121/198) has a market estimate of €0.06, down 25.0% this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Castform 121/198 rare?

It is a Common from Chilling Reign, a 198-card set.

Is Castform 121/198 tournament legal?

Castform 121/198 is legal in Expanded.

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