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.

Artifact Mjollnir · Extreme Force Special Edition 80237445/4

Artifact Mjollnir (Extreme Force Special Edition 80237445/4), Common. Market price $0.23, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.

You can Set this card from your hand to your Spell & Trap Zone as a Spell. During your opponent's turn, if this Set card in the Spell & Trap Zone is destroyed and sent to your GY: Special Summon it. If this card is Special Summoned during your opponent's turn: Target 1 "Artifact" monster in your GY; Special Summon it in Defense Position, also you cannot Special Summon monsters until the end of the next turn, except "Artifact" monsters. You can only use this effect of "Artifact Mjollnir" once per turn.

Weekly price history

Week	Market price
2026-W31	$0.15
2026-W32	$0.32
2026-W33	$0.31
2026-W34	$0.31
2026-W35	$0.31
2026-W36	$0.23
2026-W37	$0.23
2026-W38	$0.23
2026-W39	$0.23

Questions

How much is Artifact Mjollnir 80237445/4 worth?

Artifact Mjollnir from Extreme Force Special Edition (80237445/4) has a market estimate of $0.23, unchanged this week. Prices are estimates from TCGPlayer and Cardmarket.

Is Artifact Mjollnir 80237445/4 rare?

It is a Common from Extreme Force Special Edition, a 4-card set.

Browse more Yu-Gi-Oh cards · All Extreme Force Special Edition cards · Build a deck · Track your collection