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.

Keening Stone · The Brothers' War Retro Artifacts 89z/189

Keening Stone (The Brothers' War Retro Artifacts 89z/189), Rare, Artifact. Market price $388.92, unchanged this week. Illustrated by Warren Mahy. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

Weekly price history

Week	Market price
2026-W31	$276.25
2026-W32	$276.25
2026-W33	$276.25
2026-W34	$293.29
2026-W35	$293.29
2026-W36	$293.29
2026-W37	$300.95
2026-W38	$388.92
2026-W39	$388.92

Questions

How much is Keening Stone 89z/189 worth?

Keening Stone from The Brothers' War Retro Artifacts (89z/189) has a market estimate of $388.92, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Keening Stone 89z/189 rare?

It is a Rare from The Brothers' War Retro Artifacts, a 189-card set.

Browse more Magic: The Gathering cards · All The Brothers' War Retro Artifacts cards · Build a deck · Track your collection